[{"_id":"11379","external_id":{"arxiv":["2109.00556"],"isi":["000809056900019"]},"date_created":"2022-05-15T22:01:41Z","publication":"Nano Letters","page":"3317-3322","article_processing_charge":"No","date_published":"2022-04-27T00:00:00Z","title":"Spontaneous gully-polarized quantum hall states in ABA trilayer graphene","date_updated":"2023-08-03T07:12:45Z","month":"04","scopus_import":"1","oa":1,"intvolume":"        22","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"8","acknowledgement":"We acknowledge funding from the Center for Nanoscience (CeNS) and by the Deutsche\r\nForschungsgemeinschaft (DFG, German Research Foundation) under Germany’s Excellence Strategy-EXC-2111-390814868 (MCQST). K.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan (Grant Number PMXP0112101001) and JSPS KAKENHI (Grant Numbers 19H05790 and JP20H00354).","main_file_link":[{"open_access":"1","url":" https://doi.org/10.48550/arXiv.2109.00556"}],"volume":22,"publisher":"American Chemical Society","day":"27","doi":"10.1021/acs.nanolett.2c00435","arxiv":1,"oa_version":"Preprint","year":"2022","author":[{"first_name":"Felix","full_name":"Winterer, Felix","last_name":"Winterer"},{"first_name":"Anna M.","full_name":"Seiler, Anna M.","last_name":"Seiler"},{"first_name":"Areg","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87","last_name":"Ghazaryan","full_name":"Ghazaryan, Areg","orcid":"0000-0001-9666-3543"},{"first_name":"Fabian R.","last_name":"Geisenhof","full_name":"Geisenhof, Fabian R."},{"last_name":"Watanabe","full_name":"Watanabe, Kenji","first_name":"Kenji"},{"full_name":"Taniguchi, Takashi","last_name":"Taniguchi","first_name":"Takashi"},{"orcid":"0000-0002-2399-5827","full_name":"Serbyn, Maksym","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym"},{"first_name":"R. Thomas","last_name":"Weitz","full_name":"Weitz, R. Thomas"}],"isi":1,"department":[{"_id":"MaSe"}],"publication_identifier":{"issn":["15306984"],"eissn":["15306992"]},"article_type":"original","citation":{"ieee":"F. Winterer <i>et al.</i>, “Spontaneous gully-polarized quantum hall states in ABA trilayer graphene,” <i>Nano Letters</i>, vol. 22, no. 8. American Chemical Society, pp. 3317–3322, 2022.","apa":"Winterer, F., Seiler, A. M., Ghazaryan, A., Geisenhof, F. R., Watanabe, K., Taniguchi, T., … Weitz, R. T. (2022). Spontaneous gully-polarized quantum hall states in ABA trilayer graphene. <i>Nano Letters</i>. American Chemical Society. <a href=\"https://doi.org/10.1021/acs.nanolett.2c00435\">https://doi.org/10.1021/acs.nanolett.2c00435</a>","short":"F. Winterer, A.M. Seiler, A. Ghazaryan, F.R. Geisenhof, K. Watanabe, T. Taniguchi, M. Serbyn, R.T. Weitz, Nano Letters 22 (2022) 3317–3322.","ista":"Winterer F, Seiler AM, Ghazaryan A, Geisenhof FR, Watanabe K, Taniguchi T, Serbyn M, Weitz RT. 2022. Spontaneous gully-polarized quantum hall states in ABA trilayer graphene. Nano Letters. 22(8), 3317–3322.","mla":"Winterer, Felix, et al. “Spontaneous Gully-Polarized Quantum Hall States in ABA Trilayer Graphene.” <i>Nano Letters</i>, vol. 22, no. 8, American Chemical Society, 2022, pp. 3317–22, doi:<a href=\"https://doi.org/10.1021/acs.nanolett.2c00435\">10.1021/acs.nanolett.2c00435</a>.","ama":"Winterer F, Seiler AM, Ghazaryan A, et al. Spontaneous gully-polarized quantum hall states in ABA trilayer graphene. <i>Nano Letters</i>. 2022;22(8):3317-3322. doi:<a href=\"https://doi.org/10.1021/acs.nanolett.2c00435\">10.1021/acs.nanolett.2c00435</a>","chicago":"Winterer, Felix, Anna M. Seiler, Areg Ghazaryan, Fabian R. Geisenhof, Kenji Watanabe, Takashi Taniguchi, Maksym Serbyn, and R. Thomas Weitz. “Spontaneous Gully-Polarized Quantum Hall States in ABA Trilayer Graphene.” <i>Nano Letters</i>. American Chemical Society, 2022. <a href=\"https://doi.org/10.1021/acs.nanolett.2c00435\">https://doi.org/10.1021/acs.nanolett.2c00435</a>."},"type":"journal_article","quality_controlled":"1","publication_status":"published","abstract":[{"text":"Bernal-stacked multilayer graphene is a versatile platform to explore quantum transport phenomena and interaction physics due to its exceptional tunability via electrostatic gating. For instance, upon applying a perpendicular electric field, its band structure exhibits several off-center Dirac points (so-called Dirac gullies) in each valley. Here, the formation of Dirac gullies and the interaction-induced breakdown of gully coherence is explored via magnetotransport measurements in high-quality Bernal-stacked (ABA) trilayer graphene. At zero magnetic field, multiple Lifshitz transitions indicating the formation of Dirac gullies are identified. In the quantum Hall regime, the emergence of Dirac gullies is evident as an increase in Landau level degeneracy. When tuning both electric and magnetic fields, electron–electron interactions can be controllably enhanced until, beyond critical electric and magnetic fields, the gully degeneracy is eventually lifted. The arising correlated ground state is consistent with a previously predicted nematic phase that spontaneously breaks the rotational gully symmetry.","lang":"eng"}],"status":"public","language":[{"iso":"eng"}]},{"volume":105,"related_material":{"record":[{"id":"12732","status":"public","relation":"dissertation_contains"}]},"main_file_link":[{"open_access":"1","url":" https://doi.org/10.48550/arXiv.2111.08603 Focus to learn more"}],"article_number":"224208","issue":"22","acknowledgement":"We thank M. Ljubotina for insightful discussions. P. B., A. M. and M. S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). D. A. was supported by the Swiss National Science Foundation and by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 864597). The development of parallel TEBD code was supported by S. Elefante from the Scientific Computing (SciComp) that is part of Scientific Service Units (SSU) of IST Austria. Some of the computations were performed on the Baobab cluster of the University of Geneva.","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","intvolume":"       105","oa":1,"publication":"Physical Review B","project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"_id":"11469","date_created":"2022-06-29T20:19:51Z","external_id":{"isi":["000823050000001"],"arxiv":["2111.08603"]},"date_updated":"2023-09-05T12:12:52Z","title":"Localization of a mobile impurity interacting with an Anderson insulator","month":"06","date_published":"2022-06-27T00:00:00Z","article_processing_charge":"No","ec_funded":1,"type":"journal_article","citation":{"chicago":"Brighi, Pietro, Alexios Michailidis, Kristina Kirova, Dmitry A. Abanin, and Maksym Serbyn. “Localization of a Mobile Impurity Interacting with an Anderson Insulator.” <i>Physical Review B</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/physrevb.105.224208\">https://doi.org/10.1103/physrevb.105.224208</a>.","ama":"Brighi P, Michailidis A, Kirova K, Abanin DA, Serbyn M. Localization of a mobile impurity interacting with an Anderson insulator. <i>Physical Review B</i>. 2022;105(22). doi:<a href=\"https://doi.org/10.1103/physrevb.105.224208\">10.1103/physrevb.105.224208</a>","ista":"Brighi P, Michailidis A, Kirova K, Abanin DA, Serbyn M. 2022. Localization of a mobile impurity interacting with an Anderson insulator. Physical Review B. 105(22), 224208.","mla":"Brighi, Pietro, et al. “Localization of a Mobile Impurity Interacting with an Anderson Insulator.” <i>Physical Review B</i>, vol. 105, no. 22, 224208, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/physrevb.105.224208\">10.1103/physrevb.105.224208</a>.","short":"P. Brighi, A. Michailidis, K. Kirova, D.A. Abanin, M. Serbyn, Physical Review B 105 (2022).","apa":"Brighi, P., Michailidis, A., Kirova, K., Abanin, D. A., &#38; Serbyn, M. (2022). Localization of a mobile impurity interacting with an Anderson insulator. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.105.224208\">https://doi.org/10.1103/physrevb.105.224208</a>","ieee":"P. Brighi, A. Michailidis, K. Kirova, D. A. Abanin, and M. Serbyn, “Localization of a mobile impurity interacting with an Anderson insulator,” <i>Physical Review B</i>, vol. 105, no. 22. American Physical Society, 2022."},"acknowledged_ssus":[{"_id":"ScienComp"}],"article_type":"original","abstract":[{"lang":"eng","text":"Thermalizing and localized many-body quantum systems present two distinct dynamical phases of matter. Recently the fate of a localized system coupled to a thermalizing system viewed as a quantum bath received significant theoretical and experimental attention. In this work, we study a mobile impurity, representing a small quantum bath, that interacts locally with an Anderson insulator with a finite density of localized particles. Using static Hartree approximation to obtain an effective disorder strength, we formulate an analytic criterion for the perturbative stability of the localization. Next, we use an approximate dynamical Hartree method and the quasi-exact time-evolved block decimation (TEBD) algorithm to study the dynamics of the system. We find that the dynamical Hartree approach which completely ignores entanglement between the impurity and localized particles predicts the delocalization of the system. In contrast, the full numerical simulation of the unitary dynamics with TEBD suggests the stability of localization on numerically accessible timescales. Finally, using an extension of the density matrix renormalization group algorithm to excited states (DMRG-X), we approximate the highly excited eigenstates of the system. We find that the impurity remains localized in the eigenstates and entanglement is enhanced in a finite region around the position of the impurity, confirming the dynamical predictions. Dynamics and the DMRG-X results provide compelling evidence for the stability of localization."}],"publication_status":"published","language":[{"iso":"eng"}],"status":"public","quality_controlled":"1","doi":"10.1103/physrevb.105.224208","arxiv":1,"oa_version":"Preprint","publisher":"American Physical Society","day":"27","publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]},"department":[{"_id":"MaSe"}],"author":[{"id":"4115AF5C-F248-11E8-B48F-1D18A9856A87","first_name":"Pietro","full_name":"Brighi, Pietro","orcid":"0000-0002-7969-2729","last_name":"Brighi"},{"full_name":"Michailidis, Alexios","orcid":"0000-0002-8443-1064","last_name":"Michailidis","first_name":"Alexios","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Kristina","id":"4aeda2ae-f847-11ec-98e0-c4a66fe174d4","full_name":"Kirova, Kristina","last_name":"Kirova"},{"first_name":"Dmitry A.","last_name":"Abanin","full_name":"Abanin, Dmitry A."},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym","orcid":"0000-0002-2399-5827","full_name":"Serbyn, Maksym","last_name":"Serbyn"}],"isi":1,"year":"2022"},{"main_file_link":[{"url":" https://doi.org/10.48550/arXiv.2109.07332","open_access":"1"}],"related_material":{"record":[{"relation":"dissertation_contains","status":"public","id":"12732"}]},"volume":105,"article_number":"L220203","intvolume":"       105","oa":1,"acknowledgement":"We acknowledge useful discussions with M. Ljubotina. P. B., A. M., and M. S. were supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899). D.A. was supported by the Swiss National Science Foundation and by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 864597). The development of parallel TEBD code was was supported by S. Elefante from the Scientific Computing (SciComp) that is part of Scientific Service Units (SSU) of IST Austria. Some of the computations were performed on the Baobab cluster of the University of Geneva.","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"22","publication":"Physical Review B","project":[{"_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"_id":"11470","external_id":{"isi":["000823050000012"],"arxiv":["2109.07332"]},"date_created":"2022-06-29T20:20:47Z","date_updated":"2023-08-03T07:23:52Z","title":"Propagation of many-body localization in an Anderson insulator","month":"06","article_processing_charge":"No","date_published":"2022-06-27T00:00:00Z","ec_funded":1,"citation":{"chicago":"Brighi, Pietro, Alexios A. Michailidis, Dmitry A. Abanin, and Maksym Serbyn. “Propagation of Many-Body Localization in an Anderson Insulator.” <i>Physical Review B</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/physrevb.105.l220203\">https://doi.org/10.1103/physrevb.105.l220203</a>.","ama":"Brighi P, Michailidis AA, Abanin DA, Serbyn M. Propagation of many-body localization in an Anderson insulator. <i>Physical Review B</i>. 2022;105(22). doi:<a href=\"https://doi.org/10.1103/physrevb.105.l220203\">10.1103/physrevb.105.l220203</a>","mla":"Brighi, Pietro, et al. “Propagation of Many-Body Localization in an Anderson Insulator.” <i>Physical Review B</i>, vol. 105, no. 22, L220203, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/physrevb.105.l220203\">10.1103/physrevb.105.l220203</a>.","ista":"Brighi P, Michailidis AA, Abanin DA, Serbyn M. 2022. Propagation of many-body localization in an Anderson insulator. Physical Review B. 105(22), L220203.","short":"P. Brighi, A.A. Michailidis, D.A. Abanin, M. Serbyn, Physical Review B 105 (2022).","apa":"Brighi, P., Michailidis, A. A., Abanin, D. A., &#38; Serbyn, M. (2022). Propagation of many-body localization in an Anderson insulator. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.105.l220203\">https://doi.org/10.1103/physrevb.105.l220203</a>","ieee":"P. Brighi, A. A. Michailidis, D. A. Abanin, and M. Serbyn, “Propagation of many-body localization in an Anderson insulator,” <i>Physical Review B</i>, vol. 105, no. 22. American Physical Society, 2022."},"type":"journal_article","acknowledged_ssus":[{"_id":"ScienComp"}],"article_type":"original","publication_status":"published","abstract":[{"text":"Many-body localization (MBL) is an example of a dynamical phase of matter that avoids thermalization. While the MBL phase is robust to weak local perturbations, the fate of an MBL system coupled to a thermalizing quantum system that represents a “heat bath” is an open question that is actively investigated theoretically and experimentally. In this work, we consider the stability of an Anderson insulator with a finite density of particles interacting with a single mobile impurity—a small quantum bath. We give perturbative arguments that support the stability of localization in the strong interaction regime. Large-scale tensor network simulations of dynamics are employed to corroborate the presence of the localized phase and give quantitative predictions in the thermodynamic limit. We develop a phenomenological description of the dynamics in the strong interaction regime, and we demonstrate that the impurity effectively turns the Anderson insulator into an MBL phase, giving rise to nontrivial entanglement dynamics well captured by our phenomenology.","lang":"eng"}],"status":"public","language":[{"iso":"eng"}],"quality_controlled":"1","doi":"10.1103/physrevb.105.l220203","oa_version":"Preprint","arxiv":1,"publisher":"American Physical Society","day":"27","department":[{"_id":"MaSe"}],"publication_identifier":{"issn":["2469-9950"],"eissn":["2469-9969"]},"year":"2022","isi":1,"author":[{"last_name":"Brighi","full_name":"Brighi, Pietro","orcid":"0000-0002-7969-2729","first_name":"Pietro","id":"4115AF5C-F248-11E8-B48F-1D18A9856A87"},{"last_name":"Michailidis","full_name":"Michailidis, Alexios A.","first_name":"Alexios A."},{"first_name":"Dmitry A.","last_name":"Abanin","full_name":"Abanin, Dmitry A."},{"first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827"}]},{"publication":"PRX Quantum","file_date_updated":"2022-06-30T07:14:48Z","external_id":{"arxiv":["2201.08194"],"isi":["000822564300001"]},"date_created":"2022-06-29T20:21:32Z","_id":"11471","project":[{"name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020"}],"month":"06","date_updated":"2023-12-13T14:47:24Z","title":"Avoiding barren plateaus using classical shadows","ec_funded":1,"article_processing_charge":"No","keyword":["General Medicine"],"date_published":"2022-06-29T00:00:00Z","license":"https://creativecommons.org/licenses/by/4.0/","related_material":{"record":[{"status":"public","relation":"dissertation_contains","id":"14622"}]},"volume":3,"intvolume":"         3","oa":1,"issue":"2","acknowledgement":"We thank Marco Cerezo, Zoe Holmes, and Nicholas Hunter-Jones for fruitful discussion and valuable feedback. We also acknowledge Adam Smith, Johannes Jakob Meyer, and Victor V. Albert for comments on the paper. The simulations were performed in the Julia programming\r\nlanguage [65] using the Yao module [66]. S.H.S., R.A.M., A.A.M. and M.S. acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899).","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_number":"020365","arxiv":1,"oa_version":"Published Version","doi":"10.1103/prxquantum.3.020365","day":"29","publisher":"American Physical Society","tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"publication_identifier":{"issn":["2691-3399"]},"department":[{"_id":"MaSe"}],"year":"2022","isi":1,"author":[{"orcid":"0000-0001-5400-8508","full_name":"Sack, Stefan","last_name":"Sack","first_name":"Stefan","id":"dd622248-f6e0-11ea-865d-ce382a1c81a5"},{"last_name":"Medina Ramos","orcid":"0000-0002-5383-2869","full_name":"Medina Ramos, Raimel A","id":"CE680B90-D85A-11E9-B684-C920E6697425","first_name":"Raimel A"},{"id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","first_name":"Alexios","full_name":"Michailidis, Alexios","orcid":"0000-0002-8443-1064","last_name":"Michailidis"},{"first_name":"Richard","last_name":"Kueng","full_name":"Kueng, Richard"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym","last_name":"Serbyn","orcid":"0000-0002-2399-5827","full_name":"Serbyn, Maksym"}],"citation":{"chicago":"Sack, Stefan, Raimel A Medina Ramos, Alexios Michailidis, Richard Kueng, and Maksym Serbyn. “Avoiding Barren Plateaus Using Classical Shadows.” <i>PRX Quantum</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/prxquantum.3.020365\">https://doi.org/10.1103/prxquantum.3.020365</a>.","ama":"Sack S, Medina Ramos RA, Michailidis A, Kueng R, Serbyn M. Avoiding barren plateaus using classical shadows. <i>PRX Quantum</i>. 2022;3(2). doi:<a href=\"https://doi.org/10.1103/prxquantum.3.020365\">10.1103/prxquantum.3.020365</a>","ista":"Sack S, Medina Ramos RA, Michailidis A, Kueng R, Serbyn M. 2022. Avoiding barren plateaus using classical shadows. PRX Quantum. 3(2), 020365.","mla":"Sack, Stefan, et al. “Avoiding Barren Plateaus Using Classical Shadows.” <i>PRX Quantum</i>, vol. 3, no. 2, 020365, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/prxquantum.3.020365\">10.1103/prxquantum.3.020365</a>.","apa":"Sack, S., Medina Ramos, R. A., Michailidis, A., Kueng, R., &#38; Serbyn, M. (2022). Avoiding barren plateaus using classical shadows. <i>PRX Quantum</i>. American Physical Society. <a href=\"https://doi.org/10.1103/prxquantum.3.020365\">https://doi.org/10.1103/prxquantum.3.020365</a>","short":"S. Sack, R.A. Medina Ramos, A. Michailidis, R. Kueng, M. Serbyn, PRX Quantum 3 (2022).","ieee":"S. Sack, R. A. Medina Ramos, A. Michailidis, R. Kueng, and M. Serbyn, “Avoiding barren plateaus using classical shadows,” <i>PRX Quantum</i>, vol. 3, no. 2. American Physical Society, 2022."},"type":"journal_article","file":[{"file_name":"2022_PRXQuantum_Sack.pdf","access_level":"open_access","success":1,"relation":"main_file","checksum":"a7706b28d24a0e32a55ea04b82a2df43","file_size":4231591,"content_type":"application/pdf","date_updated":"2022-06-30T07:14:48Z","date_created":"2022-06-30T07:14:48Z","creator":"dernst","file_id":"11472"}],"article_type":"original","ddc":["530"],"status":"public","has_accepted_license":"1","language":[{"iso":"eng"}],"abstract":[{"lang":"eng","text":"Variational quantum algorithms are promising algorithms for achieving quantum advantage on nearterm devices. The quantum hardware is used to implement a variational wave function and measure observables, whereas the classical computer is used to store and update the variational parameters. The optimization landscape of expressive variational ansätze is however dominated by large regions in parameter space, known as barren plateaus, with vanishing gradients, which prevents efficient optimization. In this work we propose a general algorithm to avoid barren plateaus in the initialization and throughout the optimization. To this end we define a notion of weak barren plateaus (WBPs) based on the entropies of local reduced density matrices. The presence of WBPs can be efficiently quantified using recently introduced shadow tomography of the quantum state with a classical computer. We demonstrate that avoidance of WBPs suffices to ensure sizable gradients in the initialization. In addition, we demonstrate that decreasing the gradient step size, guided by the entropies allows WBPs to be avoided during the optimization process. This paves the way for efficient barren plateau-free optimization on near-term devices. "}],"publication_status":"published","quality_controlled":"1"},{"volume":4,"article_number":"043177","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","acknowledgement":"We thank G. Blatter, T. Ihn, K. Ensslin, M. Goldstein, C. Carisch, and J. del Pino for illuminating discussions and acknowledge financial support from the Swiss National Science Foundation (SNSF) through Project No. 190078, and from the Deutsche Forschungsgemeinschaft (DFG) - Project No. 449653034. Our numerical implementations are based on the ITensors JULIA library [64].","issue":"4","intvolume":"         4","oa":1,"scopus_import":"1","title":"Entanglement-based observables for quantum impurities","date_updated":"2023-02-13T09:08:28Z","month":"12","date_published":"2022-12-01T00:00:00Z","article_processing_charge":"No","file_date_updated":"2023-01-20T12:03:31Z","publication":"Physical Review Research","_id":"12111","date_created":"2023-01-08T23:00:53Z","publication_status":"published","abstract":[{"lang":"eng","text":"Quantum impurities exhibit fascinating many-body phenomena when the small interacting impurity changes the physics of a large noninteracting environment. The characterisation of such strongly correlated nonperturbative effects is particularly challenging due to the infinite size of the environment, and the inability of local correlators to capture the buildup of long-ranged entanglement in the system. Here, we harness an entanglement-based observable—the purity of the impurity—as a witness for the formation of strong correlations. We showcase the utility of our scheme by exactly solving the open Kondo box model in the small box limit, and thus describe all-electronic dot-cavity devices. Specifically, we conclusively characterize the metal-to-insulator phase transition in the system and identify how the (conducting) dot-lead Kondo singlet is quenched by an (insulating) intraimpurity singlet formation. Furthermore, we propose an experimentally feasible tomography protocol for the measurement of the purity, which motivates the observation of impurity physics through their entanglement build up."}],"language":[{"iso":"eng"}],"has_accepted_license":"1","status":"public","quality_controlled":"1","file":[{"file_name":"2022_PhysicalReviewResearch_Stocker.pdf","access_level":"open_access","success":1,"checksum":"556820cf6e4af77c8476e5b8f4114d1a","relation":"main_file","file_size":2941167,"content_type":"application/pdf","date_updated":"2023-01-20T12:03:31Z","date_created":"2023-01-20T12:03:31Z","creator":"dernst","file_id":"12328"}],"type":"journal_article","citation":{"mla":"Stocker, Lidia, et al. “Entanglement-Based Observables for Quantum Impurities.” <i>Physical Review Research</i>, vol. 4, no. 4, 043177, American Physical Society, 2022, doi:<a href=\"https://doi.org/10.1103/PhysRevResearch.4.043177\">10.1103/PhysRevResearch.4.043177</a>.","ista":"Stocker L, Sack S, Ferguson MS, Zilberberg O. 2022. Entanglement-based observables for quantum impurities. Physical Review Research. 4(4), 043177.","chicago":"Stocker, Lidia, Stefan Sack, Michael S. Ferguson, and Oded Zilberberg. “Entanglement-Based Observables for Quantum Impurities.” <i>Physical Review Research</i>. American Physical Society, 2022. <a href=\"https://doi.org/10.1103/PhysRevResearch.4.043177\">https://doi.org/10.1103/PhysRevResearch.4.043177</a>.","ama":"Stocker L, Sack S, Ferguson MS, Zilberberg O. Entanglement-based observables for quantum impurities. <i>Physical Review Research</i>. 2022;4(4). doi:<a href=\"https://doi.org/10.1103/PhysRevResearch.4.043177\">10.1103/PhysRevResearch.4.043177</a>","ieee":"L. Stocker, S. Sack, M. S. Ferguson, and O. Zilberberg, “Entanglement-based observables for quantum impurities,” <i>Physical Review Research</i>, vol. 4, no. 4. American Physical Society, 2022.","short":"L. Stocker, S. Sack, M.S. Ferguson, O. Zilberberg, Physical Review Research 4 (2022).","apa":"Stocker, L., Sack, S., Ferguson, M. S., &#38; Zilberberg, O. (2022). Entanglement-based observables for quantum impurities. <i>Physical Review Research</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevResearch.4.043177\">https://doi.org/10.1103/PhysRevResearch.4.043177</a>"},"ddc":["530"],"article_type":"original","department":[{"_id":"MaSe"}],"publication_identifier":{"issn":["2643-1564"]},"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"author":[{"first_name":"Lidia","full_name":"Stocker, Lidia","last_name":"Stocker"},{"last_name":"Sack","full_name":"Sack, Stefan","id":"dd622248-f6e0-11ea-865d-ce382a1c81a5","first_name":"Stefan"},{"first_name":"Michael S.","last_name":"Ferguson","full_name":"Ferguson, Michael S."},{"first_name":"Oded","last_name":"Zilberberg","full_name":"Zilberberg, Oded"}],"year":"2022","doi":"10.1103/PhysRevResearch.4.043177","oa_version":"Published Version","publisher":"American Physical Society","day":"01"},{"article_type":"original","type":"journal_article","citation":{"mla":"Diringer, Asaf A., and Tobias Gulden. “Impact of Drive Harmonics on the Stability of Floquet Many-Body Localization.” <i>Physical Review B</i>, vol. 103, no. 21, 214204, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/PhysRevB.103.214204\">10.1103/PhysRevB.103.214204</a>.","ista":"Diringer AA, Gulden T. 2021. Impact of drive harmonics on the stability of Floquet many-body localization. Physical Review B. 103(21), 214204.","ama":"Diringer AA, Gulden T. Impact of drive harmonics on the stability of Floquet many-body localization. <i>Physical Review B</i>. 2021;103(21). doi:<a href=\"https://doi.org/10.1103/PhysRevB.103.214204\">10.1103/PhysRevB.103.214204</a>","chicago":"Diringer, Asaf A., and Tobias Gulden. “Impact of Drive Harmonics on the Stability of Floquet Many-Body Localization.” <i>Physical Review B</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/PhysRevB.103.214204\">https://doi.org/10.1103/PhysRevB.103.214204</a>.","ieee":"A. A. Diringer and T. Gulden, “Impact of drive harmonics on the stability of Floquet many-body localization,” <i>Physical Review B</i>, vol. 103, no. 21. American Physical Society, 2021.","apa":"Diringer, A. A., &#38; Gulden, T. (2021). Impact of drive harmonics on the stability of Floquet many-body localization. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevB.103.214204\">https://doi.org/10.1103/PhysRevB.103.214204</a>","short":"A.A. Diringer, T. Gulden, Physical Review B 103 (2021)."},"quality_controlled":"1","status":"public","language":[{"iso":"eng"}],"publication_status":"published","abstract":[{"text":"We investigate how the critical driving amplitude at the Floquet many-body localized (MBL) to ergodic phase transition differs between smooth and nonsmooth drives. To this end, we numerically study a disordered spin-1/2 chain which is periodically driven by a sine or square-wave drive over a wide range of driving frequencies. In both cases the critical driving amplitude increases monotonically with the frequency, and at large frequencies it is identical for the two drives. However, at low and intermediate frequencies the critical amplitude of the square-wave drive depends strongly on the frequency, while that of the sinusoidal drive is almost constant over a wide frequency range. By analyzing the density of drive-induced resonances we conclude that this difference is due to resonances induced by the higher harmonics which are present (absent) in the Fourier spectrum of the square-wave (sine) drive. Furthermore, we suggest a numerically efficient method for estimating the frequency dependence of the critical driving amplitudes for different drives which is based on calculating the density of drive-induced resonances. We conclude that delocalization occurs once the density of drive-induced resonances reaches a critical value determined only by the static system.","lang":"eng"}],"day":"21","publisher":"American Physical Society","oa_version":"Preprint","arxiv":1,"doi":"10.1103/PhysRevB.103.214204","year":"2021","author":[{"first_name":"Asaf A.","full_name":"Diringer, Asaf A.","last_name":"Diringer"},{"id":"1083E038-9F73-11E9-A4B5-532AE6697425","first_name":"Tobias","orcid":"0000-0001-6814-7541","full_name":"Gulden, Tobias","last_name":"Gulden"}],"isi":1,"department":[{"_id":"MaSe"}],"publication_identifier":{"issn":["24699950"],"eissn":["24699969"]},"oa":1,"intvolume":"       103","acknowledgement":"We thank Y. Bar Lev, T. Biadse, and, particularly, E. Bairey and B. Katzir for illuminating discussions and their many insights and help. The authors thank N. Lindner for his support throughout this project. We are further grateful to M. Serbyn, A. Kamenev, A. Turner, and S. de Nicola for reading the manuscript and providing good feedback and suggestions. We acknowledge financial support from the Defense Advanced Research Projects Agency through the DRINQS program, Grant No. D18AC00025. T.G. was in part supported by an Aly Kaufman Fellowship at the Technion. T.G. acknowledges funding from the Institute of Science and Technology (IST) Austria and from the European Union’s Horizon 2020 research and innovation program under Marie SkłodowskaCurie Grant Agreement No. 754411.under the Marie Skłodowska-Curie Grant Agreement No.754411.","issue":"21","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_number":"214204","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2007.14879"}],"volume":103,"external_id":{"arxiv":["2007.14879"],"isi":["000664429700005"]},"date_created":"2020-08-04T13:03:40Z","project":[{"grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425","call_identifier":"H2020","name":"ISTplus - Postdoctoral Fellowships"}],"_id":"8198","publication":"Physical Review B","ec_funded":1,"article_processing_charge":"No","date_published":"2021-06-21T00:00:00Z","month":"06","date_updated":"2023-08-04T10:56:33Z","title":"Impact of drive harmonics on the stability of Floquet many-body localization"},{"abstract":[{"lang":"eng","text":"We study dynamics and thermodynamics of ion transport in narrow, water-filled channels, considered as effective 1D Coulomb systems. The long range nature of the inter-ion interactions comes about due to the dielectric constants mismatch between the water and the surrounding medium, confining the electric filed to stay mostly within the water-filled channel. Statistical mechanics of such Coulomb systems is dominated by entropic effects which may be accurately accounted for by mapping onto an effective quantum mechanics. In presence of multivalent ions the corresponding quantum mechanics appears to be non-Hermitian. In this review we discuss a framework for semiclassical calculations for the effective non-Hermitian Hamiltonians. Non-Hermiticity elevates WKB action integrals from the real line to closed cycles on a complex Riemann surfaces where direct calculations are not attainable. We circumvent this issue by applying tools from algebraic topology, such as the Picard-Fuchs equation. We discuss how its solutions relate to the thermodynamics and correlation functions of multivalent solutions within narrow, water-filled channels. "}],"publication_status":"published","language":[{"iso":"eng"}],"has_accepted_license":"1","status":"public","quality_controlled":"1","file":[{"date_created":"2021-01-19T11:11:14Z","creator":"tgulden","file_id":"9021","access_level":"open_access","file_name":"Final published paper.pdf","date_updated":"2021-01-19T11:11:14Z","content_type":"application/pdf","file_size":981285,"checksum":"6cd0e706156827c45c740534bd32c179","relation":"main_file"}],"type":"journal_article","citation":{"apa":"Gulden, T., &#38; Kamenev, A. (2021). Dynamics of ion channels via non-hermitian quantum mechanics. <i>Entropy</i>. MDPI. <a href=\"https://doi.org/10.3390/e23010125\">https://doi.org/10.3390/e23010125</a>","short":"T. Gulden, A. Kamenev, Entropy 23 (2021).","ieee":"T. Gulden and A. Kamenev, “Dynamics of ion channels via non-hermitian quantum mechanics,” <i>Entropy</i>, vol. 23, no. 1. MDPI, 2021.","ama":"Gulden T, Kamenev A. Dynamics of ion channels via non-hermitian quantum mechanics. <i>Entropy</i>. 2021;23(1). doi:<a href=\"https://doi.org/10.3390/e23010125\">10.3390/e23010125</a>","chicago":"Gulden, Tobias, and Alex Kamenev. “Dynamics of Ion Channels via Non-Hermitian Quantum Mechanics.” <i>Entropy</i>. MDPI, 2021. <a href=\"https://doi.org/10.3390/e23010125\">https://doi.org/10.3390/e23010125</a>.","ista":"Gulden T, Kamenev A. 2021. Dynamics of ion channels via non-hermitian quantum mechanics. Entropy. 23(1), e23010125.","mla":"Gulden, Tobias, and Alex Kamenev. “Dynamics of Ion Channels via Non-Hermitian Quantum Mechanics.” <i>Entropy</i>, vol. 23, no. 1, e23010125, MDPI, 2021, doi:<a href=\"https://doi.org/10.3390/e23010125\">10.3390/e23010125</a>."},"ddc":["530"],"article_type":"original","department":[{"_id":"MaSe"}],"publication_identifier":{"eissn":["1099-4300"]},"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"isi":1,"author":[{"id":"1083E038-9F73-11E9-A4B5-532AE6697425","first_name":"Tobias","last_name":"Gulden","orcid":"0000-0001-6814-7541","full_name":"Gulden, Tobias"},{"first_name":"Alex","full_name":"Kamenev, Alex","last_name":"Kamenev"}],"year":"2021","doi":"10.3390/e23010125","oa_version":"Published Version","arxiv":1,"publisher":"MDPI","day":"19","volume":23,"article_number":"e23010125","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"1","acknowledgement":"A.K. was supported by NSF grants DMR-2037654. T.G. acknowledges funding from the Institute of Science and Technology (IST) Austria, and from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie Grant Agreement No. 754411.\r\nWe are indebted to Boris Shklovskii for introducing us to the problem, and Alexander Gorsky and Peter Koroteev for introducing us to the Picard-Fuchs methods. A very special thanks goes to Michael Janas for several years of excellent collaboration on these topics. TG thanks Michael Kreshchuk for introduction to the exact WKB method and great collaboration on related projects. Figure 3 and Figure 4 are reproduced from Reference [25] with friendly permission by the Russian Academy of Sciences. Figure 2, Figure 4, Figure 5, Figure 6, and Figure 8 are reproduced from Reference [26] with friendly permission by IOP Publishing.","oa":1,"intvolume":"        23","date_updated":"2023-08-07T13:34:18Z","title":"Dynamics of ion channels via non-hermitian quantum mechanics","month":"01","date_published":"2021-01-19T00:00:00Z","article_processing_charge":"Yes","ec_funded":1,"file_date_updated":"2021-01-19T11:11:14Z","publication":"Entropy","_id":"9020","project":[{"call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425","grant_number":"754411","name":"ISTplus - Postdoctoral Fellowships"}],"date_created":"2021-01-19T11:12:06Z","external_id":{"isi":["000610122000001"],"arxiv":["2012.01390"]}},{"quality_controlled":"1","abstract":[{"text":"The analogy between an equilibrium partition function and the return probability in many-body unitary dynamics has led to the concept of dynamical quantum phase transition (DQPT). DQPTs are defined by nonanalyticities in the return amplitude and are present in many models. In some cases, DQPTs can be related to equilibrium concepts, such as order parameters, yet their universal description is an open question. In this Letter, we provide first steps toward a classification of DQPTs by using a matrix product state description of unitary dynamics in the thermodynamic limit. This allows us to distinguish the two limiting cases of “precession” and “entanglement” DQPTs, which are illustrated using an analytical description in the quantum Ising model. While precession DQPTs are characterized by a large entanglement gap and are semiclassical in their nature, entanglement DQPTs occur near avoided crossings in the entanglement spectrum and can be distinguished by a complex pattern of nonlocal correlations. We demonstrate the existence of precession and entanglement DQPTs beyond Ising models, discuss observables that can distinguish them, and relate their interplay to complex DQPT phenomenology.","lang":"eng"}],"publication_status":"published","status":"public","has_accepted_license":"1","language":[{"iso":"eng"}],"ddc":["530"],"article_type":"original","file":[{"creator":"dernst","date_created":"2021-02-03T12:47:04Z","file_id":"9074","success":1,"access_level":"open_access","file_name":"2021_PhysicalRevLett_DeNicola.pdf","date_updated":"2021-02-03T12:47:04Z","content_type":"application/pdf","file_size":398075,"checksum":"d9acbc502390ed7a97e631d23ae19ecd","relation":"main_file"}],"citation":{"apa":"De Nicola, S., Michailidis, A., &#38; Serbyn, M. (2021). Entanglement view of dynamical quantum phase transitions. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevlett.126.040602\">https://doi.org/10.1103/physrevlett.126.040602</a>","short":"S. De Nicola, A. Michailidis, M. Serbyn, Physical Review Letters 126 (2021).","ieee":"S. De Nicola, A. Michailidis, and M. Serbyn, “Entanglement view of dynamical quantum phase transitions,” <i>Physical Review Letters</i>, vol. 126, no. 4. American Physical Society, 2021.","ama":"De Nicola S, Michailidis A, Serbyn M. Entanglement view of dynamical quantum phase transitions. <i>Physical Review Letters</i>. 2021;126(4). doi:<a href=\"https://doi.org/10.1103/physrevlett.126.040602\">10.1103/physrevlett.126.040602</a>","chicago":"De Nicola, Stefano, Alexios Michailidis, and Maksym Serbyn. “Entanglement View of Dynamical Quantum Phase Transitions.” <i>Physical Review Letters</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/physrevlett.126.040602\">https://doi.org/10.1103/physrevlett.126.040602</a>.","mla":"De Nicola, Stefano, et al. “Entanglement View of Dynamical Quantum Phase Transitions.” <i>Physical Review Letters</i>, vol. 126, no. 4, 040602, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/physrevlett.126.040602\">10.1103/physrevlett.126.040602</a>.","ista":"De Nicola S, Michailidis A, Serbyn M. 2021. Entanglement view of dynamical quantum phase transitions. Physical Review Letters. 126(4), 040602."},"type":"journal_article","year":"2021","isi":1,"author":[{"last_name":"De Nicola","full_name":"De Nicola, Stefano","orcid":"0000-0002-4842-6671","id":"42832B76-F248-11E8-B48F-1D18A9856A87","first_name":"Stefano"},{"last_name":"Michailidis","full_name":"Michailidis, Alexios","orcid":"0000-0002-8443-1064","first_name":"Alexios","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","last_name":"Serbyn"}],"publication_identifier":{"eissn":["1079-7114"],"issn":["0031-9007"]},"department":[{"_id":"MaSe"}],"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"publisher":"American Physical Society","day":"29","doi":"10.1103/physrevlett.126.040602","arxiv":1,"oa_version":"Published Version","article_number":"040602","intvolume":"       126","oa":1,"acknowledgement":"S. D. N. acknowledges funding from the Institute of Science and Technology (IST) Austria and from the European Union’s Horizon 2020 Research and Innovation Programme under the Marie Skłodowska-Curie Grant Agreement No. 754411. A. M. and M. S. were supported by the European Research Council (ERC) under the European Union’s Horizon 2020 Research and\r\nInnovation Programme (Grant Agreement No. 850899).","issue":"4","user_id":"c635000d-4b10-11ee-a964-aac5a93f6ac1","volume":126,"article_processing_charge":"Yes","keyword":["General Physics and Astronomy"],"date_published":"2021-01-29T00:00:00Z","ec_funded":1,"date_updated":"2023-09-05T12:08:58Z","title":"Entanglement view of dynamical quantum phase transitions","month":"01","_id":"9048","project":[{"name":"ISTplus - Postdoctoral Fellowships","_id":"260C2330-B435-11E9-9278-68D0E5697425","grant_number":"754411","call_identifier":"H2020"},{"grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"external_id":{"isi":["000613148200001"],"arxiv":["2008.04894"]},"date_created":"2021-02-01T09:20:00Z","publication":"Physical Review Letters","file_date_updated":"2021-02-03T12:47:04Z"},{"intvolume":"      2021","oa":1,"acknowledgement":"S D N would like to thank M J Bhaseen, J Chalker, B Doyon, V Gritsev, A Lamacraft,\r\nA Michailidis and M Serbyn for helpful feedback and stimulating conversations. S D N\r\nacknowledges funding from the Institute of Science and Technology (IST) Austria, and\r\nfrom the European Union’s Horizon 2020 research and innovation program under the\r\nMarie Sk\blodowska-Curie Grant Agreement No. 754411. S D N also acknowledges funding\r\nfrom the EPSRC Center for Doctoral Training in Cross-Disciplinary Approaches to Non-\r\nEquilibrium Systems (CANES) under Grant EP/L015854/1. S D N is grateful to IST\r\nAustria for providing open access funding.","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"1","article_number":"013101","volume":2021,"ec_funded":1,"article_processing_charge":"No","keyword":["Statistics","Probability and Uncertainty","Statistics and Probability","Statistical and Nonlinear Physics"],"date_published":"2021-01-05T00:00:00Z","month":"01","date_updated":"2023-08-07T13:46:28Z","title":"Disentanglement approach to quantum spin ground states: Field theory and stochastic simulation","external_id":{"isi":["000605080300001"]},"date_created":"2021-02-17T17:48:46Z","_id":"9158","project":[{"name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425","grant_number":"754411"},{"name":"IST Austria Open Access Fund","_id":"B67AFEDC-15C9-11EA-A837-991A96BB2854"}],"publication":"Journal of Statistical Mechanics: Theory and Experiment","file_date_updated":"2021-02-19T14:04:40Z","quality_controlled":"1","has_accepted_license":"1","status":"public","language":[{"iso":"eng"}],"publication_status":"published","abstract":[{"lang":"eng","text":"While several tools have been developed to study the ground state of many-body quantum spin systems, the limitations of existing techniques call for the exploration of new approaches. In this manuscript we develop an alternative analytical and numerical framework for many-body quantum spin ground states, based on the disentanglement formalism. In this approach, observables are exactly expressed as Gaussian-weighted functional integrals over scalar fields. We identify the leading contribution to these integrals, given by the saddle point of a suitable effective action. Analytically, we develop a field-theoretical expansion of the functional integrals, performed by means of appropriate Feynman rules. The expansion can be truncated to a desired order to obtain analytical approximations to observables. Numerically, we show that the disentanglement approach can be used to compute ground state expectation values from classical stochastic processes. While the associated fluctuations grow exponentially with imaginary time and the system size, this growth can be mitigated by means of an importance sampling scheme based on knowledge of the saddle point configuration. We illustrate the advantages and limitations of our methods by considering the quantum Ising model in 1, 2 and 3 spatial dimensions. Our analytical and numerical approaches are applicable to a broad class of systems, bridging concepts from quantum lattice models, continuum field theory, and classical stochastic processes."}],"article_type":"original","ddc":["530"],"type":"journal_article","citation":{"ista":"De Nicola S. 2021. Disentanglement approach to quantum spin ground states: Field theory and stochastic simulation. Journal of Statistical Mechanics: Theory and Experiment. 2021(1), 013101.","mla":"De Nicola, Stefano. “Disentanglement Approach to Quantum Spin Ground States: Field Theory and Stochastic Simulation.” <i>Journal of Statistical Mechanics: Theory and Experiment</i>, vol. 2021, no. 1, 013101, IOP Publishing, 2021, doi:<a href=\"https://doi.org/10.1088/1742-5468/abc7c7\">10.1088/1742-5468/abc7c7</a>.","ama":"De Nicola S. Disentanglement approach to quantum spin ground states: Field theory and stochastic simulation. <i>Journal of Statistical Mechanics: Theory and Experiment</i>. 2021;2021(1). doi:<a href=\"https://doi.org/10.1088/1742-5468/abc7c7\">10.1088/1742-5468/abc7c7</a>","chicago":"De Nicola, Stefano. “Disentanglement Approach to Quantum Spin Ground States: Field Theory and Stochastic Simulation.” <i>Journal of Statistical Mechanics: Theory and Experiment</i>. IOP Publishing, 2021. <a href=\"https://doi.org/10.1088/1742-5468/abc7c7\">https://doi.org/10.1088/1742-5468/abc7c7</a>.","ieee":"S. De Nicola, “Disentanglement approach to quantum spin ground states: Field theory and stochastic simulation,” <i>Journal of Statistical Mechanics: Theory and Experiment</i>, vol. 2021, no. 1. IOP Publishing, 2021.","short":"S. De Nicola, Journal of Statistical Mechanics: Theory and Experiment 2021 (2021).","apa":"De Nicola, S. (2021). Disentanglement approach to quantum spin ground states: Field theory and stochastic simulation. <i>Journal of Statistical Mechanics: Theory and Experiment</i>. IOP Publishing. <a href=\"https://doi.org/10.1088/1742-5468/abc7c7\">https://doi.org/10.1088/1742-5468/abc7c7</a>"},"file":[{"file_name":"2021_JourStatMech_deNicola.pdf","success":1,"access_level":"open_access","checksum":"64e2aae4837790db26e1dd1986c69c07","relation":"main_file","content_type":"application/pdf","date_updated":"2021-02-19T14:04:40Z","file_size":1693609,"creator":"dernst","date_created":"2021-02-19T14:04:40Z","file_id":"9172"}],"year":"2021","isi":1,"author":[{"last_name":"De Nicola","full_name":"De Nicola, Stefano","orcid":"0000-0002-4842-6671","first_name":"Stefano","id":"42832B76-F248-11E8-B48F-1D18A9856A87"}],"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"department":[{"_id":"MaSe"}],"publication_identifier":{"issn":["1742-5468"]},"day":"05","publisher":"IOP Publishing","oa_version":"Published Version","doi":"10.1088/1742-5468/abc7c7"},{"volume":427,"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/1911.04501"}],"user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"4","intvolume":"       427","oa":1,"article_number":"168415","scopus_import":"1","month":"04","date_updated":"2023-08-07T13:58:30Z","title":"Distinguishing localization from chaos: Challenges in finite-size systems","date_published":"2021-04-01T00:00:00Z","article_processing_charge":"No","publication":"Annals of Physics","date_created":"2021-03-07T23:01:25Z","external_id":{"arxiv":["1911.04501"],"isi":["000634879800007"]},"_id":"9224","language":[{"iso":"eng"}],"status":"public","publication_status":"published","abstract":[{"text":"We re-examine attempts to study the many-body localization transition using measures that are physically natural on the ergodic/quantum chaotic regime of the phase diagram. Using simple scaling arguments and an analysis of various models for which rigorous results are available, we find that these measures can be particularly adversely affected by the strong finite-size effects observed in nearly all numerical studies of many-body localization. This severely impacts their utility in probing the transition and the localized phase. In light of this analysis, we discuss a recent study (Šuntajs et al., 2020) of the behaviour of the Thouless energy and level repulsion in disordered spin chains, and its implications for the question of whether MBL is a true phase of matter.","lang":"eng"}],"quality_controlled":"1","citation":{"mla":"Abanin, D. A., et al. “Distinguishing Localization from Chaos: Challenges in Finite-Size Systems.” <i>Annals of Physics</i>, vol. 427, no. 4, 168415, Elsevier, 2021, doi:<a href=\"https://doi.org/10.1016/j.aop.2021.168415\">10.1016/j.aop.2021.168415</a>.","ista":"Abanin DA, Bardarson JH, De Tomasi G, Gopalakrishnan S, Khemani V, Parameswaran SA, Pollmann F, Potter AC, Serbyn M, Vasseur R. 2021. Distinguishing localization from chaos: Challenges in finite-size systems. Annals of Physics. 427(4), 168415.","chicago":"Abanin, D. A., J. H. Bardarson, G. De Tomasi, S. Gopalakrishnan, V. Khemani, S. A. Parameswaran, F. Pollmann, A. C. Potter, Maksym Serbyn, and R. Vasseur. “Distinguishing Localization from Chaos: Challenges in Finite-Size Systems.” <i>Annals of Physics</i>. Elsevier, 2021. <a href=\"https://doi.org/10.1016/j.aop.2021.168415\">https://doi.org/10.1016/j.aop.2021.168415</a>.","ama":"Abanin DA, Bardarson JH, De Tomasi G, et al. Distinguishing localization from chaos: Challenges in finite-size systems. <i>Annals of Physics</i>. 2021;427(4). doi:<a href=\"https://doi.org/10.1016/j.aop.2021.168415\">10.1016/j.aop.2021.168415</a>","ieee":"D. A. Abanin <i>et al.</i>, “Distinguishing localization from chaos: Challenges in finite-size systems,” <i>Annals of Physics</i>, vol. 427, no. 4. Elsevier, 2021.","short":"D.A. Abanin, J.H. Bardarson, G. De Tomasi, S. Gopalakrishnan, V. Khemani, S.A. Parameswaran, F. Pollmann, A.C. Potter, M. Serbyn, R. Vasseur, Annals of Physics 427 (2021).","apa":"Abanin, D. A., Bardarson, J. H., De Tomasi, G., Gopalakrishnan, S., Khemani, V., Parameswaran, S. A., … Vasseur, R. (2021). Distinguishing localization from chaos: Challenges in finite-size systems. <i>Annals of Physics</i>. Elsevier. <a href=\"https://doi.org/10.1016/j.aop.2021.168415\">https://doi.org/10.1016/j.aop.2021.168415</a>"},"type":"journal_article","article_type":"original","publication_identifier":{"issn":["00034916"],"eissn":["1096035X"]},"department":[{"_id":"MaSe"}],"isi":1,"author":[{"full_name":"Abanin, D. A.","last_name":"Abanin","first_name":"D. A."},{"full_name":"Bardarson, J. H.","last_name":"Bardarson","first_name":"J. H."},{"first_name":"G.","full_name":"De Tomasi, G.","last_name":"De Tomasi"},{"first_name":"S.","full_name":"Gopalakrishnan, S.","last_name":"Gopalakrishnan"},{"first_name":"V.","last_name":"Khemani","full_name":"Khemani, V."},{"full_name":"Parameswaran, S. A.","last_name":"Parameswaran","first_name":"S. A."},{"first_name":"F.","full_name":"Pollmann, F.","last_name":"Pollmann"},{"full_name":"Potter, A. C.","last_name":"Potter","first_name":"A. C."},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","last_name":"Serbyn"},{"first_name":"R.","full_name":"Vasseur, R.","last_name":"Vasseur"}],"year":"2021","oa_version":"Preprint","arxiv":1,"doi":"10.1016/j.aop.2021.168415","day":"01","publisher":"Elsevier"},{"doi":"10.1038/s41586-021-03938-w","oa_version":"Preprint","arxiv":1,"publisher":"Springer Nature","day":"01","department":[{"_id":"MaSe"},{"_id":"MiLe"}],"publication_identifier":{"issn":["0028-0836"],"eissn":["1476-4687"]},"year":"2021","author":[{"full_name":"Zhou, Haoxin","last_name":"Zhou","first_name":"Haoxin"},{"last_name":"Xie","full_name":"Xie, Tian","first_name":"Tian"},{"full_name":"Ghazaryan, Areg","orcid":"0000-0001-9666-3543","last_name":"Ghazaryan","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87","first_name":"Areg"},{"last_name":"Holder","full_name":"Holder, Tobias","first_name":"Tobias"},{"first_name":"James R.","last_name":"Ehrets","full_name":"Ehrets, James R."},{"first_name":"Eric M.","last_name":"Spanton","full_name":"Spanton, Eric M."},{"first_name":"Takashi","last_name":"Taniguchi","full_name":"Taniguchi, Takashi"},{"last_name":"Watanabe","full_name":"Watanabe, Kenji","first_name":"Kenji"},{"first_name":"Erez","last_name":"Berg","full_name":"Berg, Erez"},{"full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym"},{"first_name":"Andrea F.","full_name":"Young, Andrea F.","last_name":"Young"}],"isi":1,"citation":{"apa":"Zhou, H., Xie, T., Ghazaryan, A., Holder, T., Ehrets, J. R., Spanton, E. M., … Young, A. F. (2021). Half and quarter metals in rhombohedral trilayer graphene. <i>Nature</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41586-021-03938-w\">https://doi.org/10.1038/s41586-021-03938-w</a>","short":"H. Zhou, T. Xie, A. Ghazaryan, T. Holder, J.R. Ehrets, E.M. Spanton, T. Taniguchi, K. Watanabe, E. Berg, M. Serbyn, A.F. Young, Nature (2021).","ieee":"H. Zhou <i>et al.</i>, “Half and quarter metals in rhombohedral trilayer graphene,” <i>Nature</i>. Springer Nature, 2021.","chicago":"Zhou, Haoxin, Tian Xie, Areg Ghazaryan, Tobias Holder, James R. Ehrets, Eric M. Spanton, Takashi Taniguchi, et al. “Half and Quarter Metals in Rhombohedral Trilayer Graphene.” <i>Nature</i>. Springer Nature, 2021. <a href=\"https://doi.org/10.1038/s41586-021-03938-w\">https://doi.org/10.1038/s41586-021-03938-w</a>.","ama":"Zhou H, Xie T, Ghazaryan A, et al. Half and quarter metals in rhombohedral trilayer graphene. <i>Nature</i>. 2021. doi:<a href=\"https://doi.org/10.1038/s41586-021-03938-w\">10.1038/s41586-021-03938-w</a>","ista":"Zhou H, Xie T, Ghazaryan A, Holder T, Ehrets JR, Spanton EM, Taniguchi T, Watanabe K, Berg E, Serbyn M, Young AF. 2021. Half and quarter metals in rhombohedral trilayer graphene. Nature.","mla":"Zhou, Haoxin, et al. “Half and Quarter Metals in Rhombohedral Trilayer Graphene.” <i>Nature</i>, Springer Nature, 2021, doi:<a href=\"https://doi.org/10.1038/s41586-021-03938-w\">10.1038/s41586-021-03938-w</a>."},"type":"journal_article","article_type":"original","abstract":[{"text":"Ferromagnetism is most common in transition metal compounds but may also arise in low-density two-dimensional electron systems, with signatures observed in silicon, III-V semiconductor systems, and graphene moiré heterostructures. Here we show that gate-tuned van Hove singularities in rhombohedral trilayer graphene drive the spontaneous ferromagnetic polarization of the electron system into one or more spin- and valley flavors. Using capacitance measurements on graphite-gated van der Waals heterostructures, we find a cascade of density- and electronic displacement field tuned phase transitions marked by negative electronic compressibility. The transitions define the boundaries between phases where quantum oscillations have either four-fold, two-fold, or one-fold degeneracy, associated with a spin and valley degenerate normal metal, spin-polarized `half-metal', and spin and valley polarized `quarter metal', respectively. For electron doping, the salient features are well captured by a phenomenological Stoner model with a valley-anisotropic Hund's coupling, likely arising from interactions at the lattice scale. For hole filling, we observe a richer phase diagram featuring a delicate interplay of broken symmetries and transitions in the Fermi surface topology. Finally, by rotational alignment of a hexagonal boron nitride substrate to induce a moiré superlattice, we find that the superlattice perturbs the preexisting isospin order only weakly, leaving the basic phase diagram intact while catalyzing the formation of topologically nontrivial gapped states whenever itinerant half- or quarter metal states occur at half- or quarter superlattice band filling. Our results show that rhombohedral trilayer graphene is an ideal platform for well-controlled tests of many-body theory and reveal magnetism in moiré materials to be fundamentally itinerant in nature.","lang":"eng"}],"publication_status":"published","status":"public","language":[{"iso":"eng"}],"quality_controlled":"1","publication":"Nature","project":[{"name":"ISTplus - Postdoctoral Fellowships","call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425","grant_number":"754411"}],"_id":"10025","external_id":{"isi":["000706977400002"],"arxiv":["2104.00653"]},"date_created":"2021-09-19T22:01:25Z","title":"Half and quarter metals in rhombohedral trilayer graphene","date_updated":"2023-08-14T07:04:06Z","month":"09","keyword":["condensed matter - mesoscale and nanoscale physics","condensed matter - strongly correlated electrons","multidisciplinary"],"article_processing_charge":"No","date_published":"2021-09-01T00:00:00Z","ec_funded":1,"scopus_import":"1","main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2104.00653"}],"related_material":{"link":[{"relation":"erratum","url":"https://doi.org/10.1038/s41586-021-04181-z"}]},"oa":1,"acknowledgement":"The authors acknowledge discussions with A. Macdonald, L. Fu, F. Wang and M. Zaletel. AFY acknowledges support of the National Science Foundation under DMR1654186, and the Gordon and Betty Moore Foundation under award GBMF9471. The authors acknowledge the use of the research facilities within the California NanoSystems Institute, supported by the University of California, Santa Barbara and the University of California, Office of the President.\r\nK.W. and T.T. acknowledge support from the Elemental Strategy Initiative conducted by the MEXT, Japan, Grant Number JPMXP0112101001 and JSPS KAKENHI, Grant Number JP20H00354. EB and TH were supported by the European Research Council (ERC) under grant HQMAT (Grant Agreement No. 817799). A.G. acknowledges support by the European Unions Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement\r\nNo. 754411.\r\n","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8"},{"ec_funded":1,"year":"2021","article_processing_charge":"No","author":[{"last_name":"Phan","full_name":"Phan, Duc T","first_name":"Duc T","id":"29C8C0B4-F248-11E8-B48F-1D18A9856A87"},{"id":"5479D234-2D30-11EA-89CC-40953DDC885E","first_name":"Jorden L","full_name":"Senior, Jorden L","orcid":"0000-0002-0672-9295","last_name":"Senior"},{"first_name":"Areg","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0001-9666-3543","full_name":"Ghazaryan, Areg","last_name":"Ghazaryan"},{"full_name":"Hatefipour, M.","last_name":"Hatefipour","first_name":"M."},{"last_name":"Strickland","full_name":"Strickland, W. M.","first_name":"W. M."},{"last_name":"Shabani","full_name":"Shabani, J.","first_name":"J."},{"first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","last_name":"Serbyn"},{"first_name":"Andrew P","id":"4AD6785A-F248-11E8-B48F-1D18A9856A87","full_name":"Higginbotham, Andrew P","orcid":"0000-0003-2607-2363","last_name":"Higginbotham"}],"date_published":"2021-07-08T00:00:00Z","month":"07","department":[{"_id":"MaSe"},{"_id":"AnHi"},{"_id":"MiLe"}],"date_updated":"2024-02-21T12:36:52Z","title":"Breakdown of induced p±ip pairing in a superconductor-semiconductor hybrid","day":"08","external_id":{"arxiv":["2107.03695"]},"date_created":"2021-09-21T08:41:02Z","project":[{"call_identifier":"H2020","_id":"260C2330-B435-11E9-9278-68D0E5697425","grant_number":"754411","name":"ISTplus - Postdoctoral Fellowships"}],"_id":"10029","oa_version":"Preprint","arxiv":1,"publication":"arXiv","oa":1,"acknowledgement":"This research was supported by the Scientific Service Units of IST Austria through resources provided by the MIBA Machine Shop and the nanofabrication facility. JS and AG were supported by funding from the European Union’s Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No.754411.","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","article_number":"2107.03695","status":"public","language":[{"iso":"eng"}],"related_material":{"record":[{"id":"10851","relation":"later_version","status":"public"},{"id":"9636","status":"public","relation":"research_data"}]},"main_file_link":[{"url":"https://arxiv.org/abs/2107.03695","open_access":"1"}],"publication_status":"submitted","abstract":[{"text":"Superconductor-semiconductor hybrids are platforms for realizing effective p-wave superconductivity. Spin-orbit coupling, combined with the proximity effect, causes the two-dimensional semiconductor to inherit p±ip intraband pairing, and application of magnetic field can then result in transitions to the normal state, partial Bogoliubov Fermi surfaces, or topological phases with Majorana modes. Experimentally probing the hybrid superconductor-semiconductor interface is challenging due to the shunting effect of the conventional superconductor. Consequently, the nature of induced pairing remains an open question. Here, we use the circuit quantum electrodynamics architecture to probe induced superconductivity in a two dimensional Al-InAs hybrid system. We observe a strong suppression of superfluid density and enhanced dissipation driven by magnetic field, which cannot be accounted for by the depairing theory of an s-wave superconductor. These observations are explained by a picture of independent intraband p±ip superconductors giving way to partial Bogoliubov Fermi surfaces, and allow for the first characterization of key properties of the hybrid superconducting system.","lang":"eng"}],"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"citation":{"mla":"Phan, Duc T., et al. “Breakdown of Induced P±ip Pairing in a Superconductor-Semiconductor Hybrid.” <i>ArXiv</i>, 2107.03695.","ista":"Phan DT, Senior JL, Ghazaryan A, Hatefipour M, Strickland WM, Shabani J, Serbyn M, Higginbotham AP. Breakdown of induced p±ip pairing in a superconductor-semiconductor hybrid. arXiv, 2107.03695.","ama":"Phan DT, Senior JL, Ghazaryan A, et al. Breakdown of induced p±ip pairing in a superconductor-semiconductor hybrid. <i>arXiv</i>.","chicago":"Phan, Duc T, Jorden L Senior, Areg Ghazaryan, M. Hatefipour, W. M. Strickland, J. Shabani, Maksym Serbyn, and Andrew P Higginbotham. “Breakdown of Induced P±ip Pairing in a Superconductor-Semiconductor Hybrid.” <i>ArXiv</i>, n.d.","ieee":"D. T. Phan <i>et al.</i>, “Breakdown of induced p±ip pairing in a superconductor-semiconductor hybrid,” <i>arXiv</i>. .","apa":"Phan, D. T., Senior, J. L., Ghazaryan, A., Hatefipour, M., Strickland, W. M., Shabani, J., … Higginbotham, A. P. (n.d.). Breakdown of induced p±ip pairing in a superconductor-semiconductor hybrid. <i>arXiv</i>.","short":"D.T. Phan, J.L. Senior, A. Ghazaryan, M. Hatefipour, W.M. Strickland, J. Shabani, M. Serbyn, A.P. Higginbotham, ArXiv (n.d.)."},"type":"preprint"},{"ec_funded":1,"article_processing_charge":"No","date_published":"2021-09-30T00:00:00Z","month":"09","title":"Entanglement transitions from restricted Boltzmann machines","date_updated":"2023-08-14T07:24:47Z","external_id":{"arxiv":["2107.05735"],"isi":["000704414400002"]},"date_created":"2021-10-02T09:03:42Z","project":[{"call_identifier":"H2020","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"_id":"10067","publication":"Physical Review B","oa":1,"intvolume":"       104","acknowledgement":"We would like to thank S. De Nicola, P. Brighi, and V. Karle for fruitful discussions and valuable feedback on the manuscript. R.M. and M.S. acknowledge support by the European Research Council (ERC) under the European Union's Horizon 2020 research and innovation program (Grant Agreement No. 850899). R.V. acknowledges support from the US Department of Energy, Office of Science, Basic Energy Sciences, under Early Career Award No. DE-SC0019168, and the Alfred P. Sloan Foundation through a Sloan Research Fellowship.","issue":"10","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_number":"104205","main_file_link":[{"url":"https://arxiv.org/abs/2107.05735","open_access":"1"}],"volume":104,"year":"2021","author":[{"id":"CE680B90-D85A-11E9-B684-C920E6697425","first_name":"Raimel A","orcid":"0000-0002-5383-2869","full_name":"Medina Ramos, Raimel A","last_name":"Medina Ramos"},{"first_name":"Romain","last_name":"Vasseur","full_name":"Vasseur, Romain"},{"orcid":"0000-0002-2399-5827","full_name":"Serbyn, Maksym","last_name":"Serbyn","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym"}],"isi":1,"publication_identifier":{"eissn":["2469-9969"],"issn":["2469-9950"]},"department":[{"_id":"MaSe"}],"day":"30","publisher":"American Physical Society","arxiv":1,"oa_version":"Preprint","doi":"10.1103/physrevb.104.104205","quality_controlled":"1","status":"public","language":[{"iso":"eng"}],"publication_status":"published","abstract":[{"text":"The search for novel entangled phases of matter has lead to the recent discovery of a new class of “entanglement transitions,” exemplified by random tensor networks and monitored quantum circuits. Most known examples can be understood as some classical ordering transitions in an underlying statistical mechanics model, where entanglement maps onto the free-energy cost of inserting a domain wall. In this paper we study the possibility of entanglement transitions driven by physics beyond such statistical mechanics mappings. Motivated by recent applications of neural-network-inspired variational Ansätze, we investigate under what conditions on the variational parameters these Ansätze can capture an entanglement transition. We study the entanglement scaling of short-range restricted Boltzmann machine (RBM) quantum states with random phases. For uncorrelated random phases, we analytically demonstrate the absence of an entanglement transition and reveal subtle finite-size effects in finite-size numerical simulations. Introducing phases with correlations decaying as 1/r^α in real space, we observe three regions with a different scaling of entanglement entropy depending on the exponent α. We study the nature of the transition between these regions, finding numerical evidence for critical behavior. Our work establishes the presence of long-range correlated phases in RBM-based wave functions as a required ingredient for entanglement transitions.","lang":"eng"}],"article_type":"original","citation":{"apa":"Medina Ramos, R. A., Vasseur, R., &#38; Serbyn, M. (2021). Entanglement transitions from restricted Boltzmann machines. <i>Physical Review B</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevb.104.104205\">https://doi.org/10.1103/physrevb.104.104205</a>","short":"R.A. Medina Ramos, R. Vasseur, M. Serbyn, Physical Review B 104 (2021).","ieee":"R. A. Medina Ramos, R. Vasseur, and M. Serbyn, “Entanglement transitions from restricted Boltzmann machines,” <i>Physical Review B</i>, vol. 104, no. 10. American Physical Society, 2021.","ama":"Medina Ramos RA, Vasseur R, Serbyn M. Entanglement transitions from restricted Boltzmann machines. <i>Physical Review B</i>. 2021;104(10). doi:<a href=\"https://doi.org/10.1103/physrevb.104.104205\">10.1103/physrevb.104.104205</a>","chicago":"Medina Ramos, Raimel A, Romain Vasseur, and Maksym Serbyn. “Entanglement Transitions from Restricted Boltzmann Machines.” <i>Physical Review B</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/physrevb.104.104205\">https://doi.org/10.1103/physrevb.104.104205</a>.","ista":"Medina Ramos RA, Vasseur R, Serbyn M. 2021. Entanglement transitions from restricted Boltzmann machines. Physical Review B. 104(10), 104205.","mla":"Medina Ramos, Raimel A., et al. “Entanglement Transitions from Restricted Boltzmann Machines.” <i>Physical Review B</i>, vol. 104, no. 10, 104205, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/physrevb.104.104205\">10.1103/physrevb.104.104205</a>."},"type":"journal_article"},{"publisher":"American Physical Society","day":"09","doi":"10.1103/physrevlett.127.247001","arxiv":1,"oa_version":"Preprint","year":"2021","author":[{"last_name":"Ghazaryan","orcid":"0000-0001-9666-3543","full_name":"Ghazaryan, Areg","first_name":"Areg","id":"4AF46FD6-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Tobias","last_name":"Holder","full_name":"Holder, Tobias"},{"id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym","last_name":"Serbyn","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827"},{"first_name":"Erez","last_name":"Berg","full_name":"Berg, Erez"}],"isi":1,"department":[{"_id":"MaSe"}],"publication_identifier":{"issn":["0031-9007"],"eissn":["1079-7114"]},"article_type":"original","type":"journal_article","citation":{"mla":"Ghazaryan, Areg, et al. “Unconventional Superconductivity in Systems with Annular Fermi Surfaces: Application to Rhombohedral Trilayer Graphene.” <i>Physical Review Letters</i>, vol. 127, no. 24, 247001, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/physrevlett.127.247001\">10.1103/physrevlett.127.247001</a>.","ista":"Ghazaryan A, Holder T, Serbyn M, Berg E. 2021. Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene. Physical Review Letters. 127(24), 247001.","ama":"Ghazaryan A, Holder T, Serbyn M, Berg E. Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene. <i>Physical Review Letters</i>. 2021;127(24). doi:<a href=\"https://doi.org/10.1103/physrevlett.127.247001\">10.1103/physrevlett.127.247001</a>","chicago":"Ghazaryan, Areg, Tobias Holder, Maksym Serbyn, and Erez Berg. “Unconventional Superconductivity in Systems with Annular Fermi Surfaces: Application to Rhombohedral Trilayer Graphene.” <i>Physical Review Letters</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/physrevlett.127.247001\">https://doi.org/10.1103/physrevlett.127.247001</a>.","ieee":"A. Ghazaryan, T. Holder, M. Serbyn, and E. Berg, “Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene,” <i>Physical Review Letters</i>, vol. 127, no. 24. American Physical Society, 2021.","short":"A. Ghazaryan, T. Holder, M. Serbyn, E. Berg, Physical Review Letters 127 (2021).","apa":"Ghazaryan, A., Holder, T., Serbyn, M., &#38; Berg, E. (2021). Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevlett.127.247001\">https://doi.org/10.1103/physrevlett.127.247001</a>"},"quality_controlled":"1","abstract":[{"lang":"eng","text":"We show that in a two-dimensional electron gas with an annular Fermi surface, long-range Coulomb interactions can lead to unconventional superconductivity by the Kohn-Luttinger mechanism. Superconductivity is strongly enhanced when the inner and outer Fermi surfaces are close to each other. The most prevalent state has chiral p-wave symmetry, but d-wave and extended s-wave pairing are also possible. We discuss these results in the context of rhombohedral trilayer graphene, where superconductivity was recently discovered in regimes where the normal state has an annular Fermi surface. Using realistic parameters, our mechanism can account for the order of magnitude of Tc, as well as its trends as a function of electron density and perpendicular displacement field. Moreover, it naturally explains some of the outstanding puzzles in this material, that include the weak temperature dependence of the resistivity above Tc, and the proximity of spin singlet superconductivity to the ferromagnetic phase."}],"publication_status":"published","status":"public","language":[{"iso":"eng"}],"_id":"10527","project":[{"call_identifier":"H2020","grant_number":"754411","_id":"260C2330-B435-11E9-9278-68D0E5697425","name":"ISTplus - Postdoctoral Fellowships"}],"external_id":{"isi":["000923819400004"],"arxiv":["2109.00011"]},"date_created":"2021-12-10T07:51:33Z","publication":"Physical Review Letters","keyword":["general physics and astronomy"],"article_processing_charge":"No","date_published":"2021-12-09T00:00:00Z","ec_funded":1,"title":"Unconventional superconductivity in systems with annular Fermi surfaces: Application to rhombohedral trilayer graphene","date_updated":"2023-08-14T13:19:13Z","month":"12","scopus_import":"1","article_number":"247001","oa":1,"intvolume":"       127","acknowledgement":"We thank Yang-Zhi Chou, Andrey Chubukov, Johannes Hofmann, Steve Kivelson, Sri Raghu, and Sankar das Sarma, Jay Sau, Fengcheng Wu, and Andrea Young for many stimulating discussions and for their comments on the manuscript. E.B. thanks S. Chatterjee, T. Wang, and M. Zaletel for a collaboration on a related topic. A.G. acknowledges support by the European Unions Horizon 2020 research and innovation program under the Marie Sklodowska-Curie Grant Agreement No. 754411. E.B. and T.H. were supported by the European Research Council (ERC) under grant HQMAT (Grant Agreement No. 817799), by the Israel-USA Binational Science Foundation (BSF), and by a Research grant from Irving and Cherna Moskowitz.","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"24","related_material":{"link":[{"url":"https://ist.ac.at/en/news/resolving-the-puzzles-of-graphene-superconductivity/","description":"News on IST Webpage","relation":"press_release"}]},"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2109.00011"}],"volume":127},{"publication_status":"published","abstract":[{"lang":"eng","text":"Classical models with complex energy landscapes represent a perspective avenue for the near-term application of quantum simulators. Until now, many theoretical works studied the performance of quantum algorithms for models with a unique ground state. However, when the classical problem is in a so-called clustering phase, the ground state manifold is highly degenerate. As an example, we consider a 3-XORSAT model defined on simple hypergraphs. The degeneracy of classical ground state manifold translates into the emergence of an extensive number of Z2 symmetries, which remain intact even in the presence of a quantum transverse magnetic field. We establish a general duality approach that restricts the quantum problem to a given sector of conserved Z2 charges and use it to study how the outcome of the quantum adiabatic algorithm depends on the hypergraph geometry. We show that the tree hypergraph which corresponds to a classically solvable instance of the 3-XORSAT problem features a constant gap, whereas the closed hypergraph encounters a second-order phase transition with a gap vanishing as a power-law in the problem size. The duality developed in this work provides a practical tool for studies of quantum models with classically degenerate energy manifold and reveals potential connections between glasses and gauge theories."}],"language":[{"iso":"eng"}],"status":"public","quality_controlled":"1","citation":{"ama":"Medina Ramos RA, Serbyn M. Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT). <i>Physical Review A</i>. 2021;104(6). doi:<a href=\"https://doi.org/10.1103/physreva.104.062423\">10.1103/physreva.104.062423</a>","chicago":"Medina Ramos, Raimel A, and Maksym Serbyn. “Duality Approach to Quantum Annealing of the 3-Variable Exclusive-or Satisfiability Problem (3-XORSAT).” <i>Physical Review A</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/physreva.104.062423\">https://doi.org/10.1103/physreva.104.062423</a>.","mla":"Medina Ramos, Raimel A., and Maksym Serbyn. “Duality Approach to Quantum Annealing of the 3-Variable Exclusive-or Satisfiability Problem (3-XORSAT).” <i>Physical Review A</i>, vol. 104, no. 6, 062423, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/physreva.104.062423\">10.1103/physreva.104.062423</a>.","ista":"Medina Ramos RA, Serbyn M. 2021. Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT). Physical Review A. 104(6), 062423.","short":"R.A. Medina Ramos, M. Serbyn, Physical Review A 104 (2021).","apa":"Medina Ramos, R. A., &#38; Serbyn, M. (2021). Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT). <i>Physical Review A</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physreva.104.062423\">https://doi.org/10.1103/physreva.104.062423</a>","ieee":"R. A. Medina Ramos and M. Serbyn, “Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT),” <i>Physical Review A</i>, vol. 104, no. 6. American Physical Society, 2021."},"type":"journal_article","article_type":"original","publication_identifier":{"issn":["2469-9926"],"eissn":["2469-9934"]},"department":[{"_id":"MaSe"}],"isi":1,"author":[{"orcid":"0000-0002-5383-2869","full_name":"Medina Ramos, Raimel A","last_name":"Medina Ramos","first_name":"Raimel A","id":"CE680B90-D85A-11E9-B684-C920E6697425"},{"first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","last_name":"Serbyn"}],"year":"2021","doi":"10.1103/physreva.104.062423","oa_version":"Preprint","arxiv":1,"publisher":"American Physical Society","day":"14","volume":104,"main_file_link":[{"open_access":"1","url":"https://arxiv.org/abs/2106.06344"}],"article_number":"062423","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"6","acknowledgement":"We would like to thank S. De Nicola, A. Michaidilis, T. Gulden, Y. Nez-Fernndez, P. Brighi, and S. Sack for fruitful discussions and valuable feedback on the manuscript. M.S. acknowledges useful discussions with E. Altman, L. Cugliandolo, and C. Laumann. We acknowledge support from the European Research Council (ERC) under the European Union's Horizon 2020 Research and Innovation Programme Grant Agreement No. 850899.","oa":1,"intvolume":"       104","title":"Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability problem (3-XORSAT)","date_updated":"2023-08-17T06:22:49Z","month":"12","date_published":"2021-12-14T00:00:00Z","article_processing_charge":"No","ec_funded":1,"publication":"Physical Review A","project":[{"call_identifier":"H2020","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"_id":"10545","date_created":"2021-12-14T20:46:07Z","external_id":{"isi":["000753659200004"],"arxiv":["2106.06344"]}},{"page":"675–685","file_date_updated":"2021-12-02T23:30:03Z","publication":"Nature Physics","date_created":"2021-05-28T09:03:50Z","external_id":{"isi":["000655563800002"],"arxiv":["2011.09486"]},"_id":"9428","project":[{"name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","call_identifier":"H2020","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899"}],"month":"06","title":"Quantum many-body scars and weak breaking of ergodicity","date_updated":"2023-10-18T08:20:59Z","ec_funded":1,"date_published":"2021-06-01T00:00:00Z","article_processing_charge":"No","volume":17,"user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","acknowledgement":"We thank our collaborators K. Bull, S. Choi, J.-Y. Desaules, W. W. Ho, A. Hudomal, M. Lukin, I. Martin, H. Pichler, N. Regnault, I. Vasić and in particular A. Michailidis and C. Turner, without whom this work would not have been possible. We also benefited from discussions with E. Altman, B. A. Bernevig, A. Chandran, P. Fendley, V. Khemani and L. Motrunich. M.S. was supported by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 850899). D.A.A. was supported by the Swiss National Science Foundation and by the ERC under the European Union’s Horizon 2020 research and innovation programme (grant agreement no. 864597). Z.P. acknowledges support by the Leverhulme Trust Research Leadership Award RL-2019-015.","issue":"6","intvolume":"        17","oa":1,"oa_version":"Preprint","arxiv":1,"doi":"10.1038/s41567-021-01230-2","day":"01","publisher":"Nature Research","department":[{"_id":"MaSe"}],"publication_identifier":{"eissn":["1745-2481"]},"author":[{"full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","last_name":"Serbyn","first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87"},{"first_name":"Dmitry A.","last_name":"Abanin","full_name":"Abanin, Dmitry A."},{"first_name":"Zlatko","full_name":"Papić, Zlatko","last_name":"Papić"}],"isi":1,"year":"2021","type":"journal_article","citation":{"mla":"Serbyn, Maksym, et al. “Quantum Many-Body Scars and Weak Breaking of Ergodicity.” <i>Nature Physics</i>, vol. 17, no. 6, Nature Research, 2021, pp. 675–685, doi:<a href=\"https://doi.org/10.1038/s41567-021-01230-2\">10.1038/s41567-021-01230-2</a>.","ista":"Serbyn M, Abanin DA, Papić Z. 2021. Quantum many-body scars and weak breaking of ergodicity. Nature Physics. 17(6), 675–685.","chicago":"Serbyn, Maksym, Dmitry A. Abanin, and Zlatko Papić. “Quantum Many-Body Scars and Weak Breaking of Ergodicity.” <i>Nature Physics</i>. Nature Research, 2021. <a href=\"https://doi.org/10.1038/s41567-021-01230-2\">https://doi.org/10.1038/s41567-021-01230-2</a>.","ama":"Serbyn M, Abanin DA, Papić Z. Quantum many-body scars and weak breaking of ergodicity. <i>Nature Physics</i>. 2021;17(6):675–685. doi:<a href=\"https://doi.org/10.1038/s41567-021-01230-2\">10.1038/s41567-021-01230-2</a>","ieee":"M. Serbyn, D. A. Abanin, and Z. Papić, “Quantum many-body scars and weak breaking of ergodicity,” <i>Nature Physics</i>, vol. 17, no. 6. Nature Research, pp. 675–685, 2021.","short":"M. Serbyn, D.A. Abanin, Z. Papić, Nature Physics 17 (2021) 675–685.","apa":"Serbyn, M., Abanin, D. A., &#38; Papić, Z. (2021). Quantum many-body scars and weak breaking of ergodicity. <i>Nature Physics</i>. Nature Research. <a href=\"https://doi.org/10.1038/s41567-021-01230-2\">https://doi.org/10.1038/s41567-021-01230-2</a>"},"file":[{"file_id":"10026","embargo":"2021-12-01","date_created":"2021-09-20T09:27:43Z","creator":"patrickd","relation":"main_file","checksum":"316ed42ea1b42b0f1a3025bb476266fc","content_type":"application/pdf","date_updated":"2021-12-02T23:30:03Z","file_size":10028836,"file_name":"RevisedQMBSreview.pdf","access_level":"open_access"}],"article_type":"review","ddc":["539"],"language":[{"iso":"eng"}],"status":"public","has_accepted_license":"1","publication_status":"published","abstract":[{"text":"Thermalization is the inevitable fate of many complex quantum systems, whose dynamics allow them to fully explore the vast configuration space regardless of the initial state---the behaviour known as quantum ergodicity. In a quest for experimental realizations of coherent long-time dynamics, efforts have focused on ergodicity-breaking mechanisms, such as integrability and localization. The recent discovery of persistent revivals in quantum simulators based on Rydberg atoms have pointed to the existence of a new type of behaviour where the system rapidly relaxes for most initial conditions, while certain initial states give rise to non-ergodic dynamics. This collective effect has been named ”quantum many-body scarring’by analogy with a related form of weak ergodicity breaking that occurs for a single particle inside a stadium billiard potential. In this Review, we provide a pedagogical introduction to quantum many-body scars and highlight the emerging connections with the semiclassical quantization of many-body systems. We discuss the relation between scars and more general routes towards weak violations of ergodicity due to embedded algebras and non-thermal eigenstates, and highlight possible applications of scars in quantum technology.","lang":"eng"}],"quality_controlled":"1"},{"doi":"10.1126/science.abg2530","oa_version":"Preprint","arxiv":1,"publisher":"AAAS","day":"26","department":[{"_id":"MaSe"}],"publication_identifier":{"issn":["0036-8075"],"eissn":["1095-9203"]},"isi":1,"author":[{"first_name":"D.","full_name":"Bluvstein, D.","last_name":"Bluvstein"},{"first_name":"A.","full_name":"Omran, A.","last_name":"Omran"},{"full_name":"Levine, H.","last_name":"Levine","first_name":"H."},{"first_name":"A.","full_name":"Keesling, A.","last_name":"Keesling"},{"full_name":"Semeghini, G.","last_name":"Semeghini","first_name":"G."},{"full_name":"Ebadi, S.","last_name":"Ebadi","first_name":"S."},{"last_name":"Wang","full_name":"Wang, T. T.","first_name":"T. T."},{"last_name":"Michailidis","orcid":"0000-0002-8443-1064","full_name":"Michailidis, Alexios","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","first_name":"Alexios"},{"first_name":"N.","last_name":"Maskara","full_name":"Maskara, N."},{"last_name":"Ho","full_name":"Ho, W. W.","first_name":"W. W."},{"first_name":"S.","full_name":"Choi, S.","last_name":"Choi"},{"first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","last_name":"Serbyn"},{"first_name":"M.","full_name":"Greiner, M.","last_name":"Greiner"},{"last_name":"Vuletić","full_name":"Vuletić, V.","first_name":"V."},{"first_name":"M. D.","full_name":"Lukin, M. D.","last_name":"Lukin"}],"year":"2021","file":[{"date_created":"2021-09-23T14:00:05Z","creator":"patrickd","file_id":"10040","file_name":"scars_subharmonic_combined_manuscript_2_11_2021 (2)-1.pdf","access_level":"open_access","success":1,"relation":"main_file","checksum":"0b356fd10ab9bb95177d4c047d4e9c1a","file_size":3671159,"content_type":"application/pdf","date_updated":"2021-09-23T14:00:05Z"}],"citation":{"apa":"Bluvstein, D., Omran, A., Levine, H., Keesling, A., Semeghini, G., Ebadi, S., … Lukin, M. D. (2021). Controlling quantum many-body dynamics in driven Rydberg atom arrays. <i>Science</i>. AAAS. <a href=\"https://doi.org/10.1126/science.abg2530\">https://doi.org/10.1126/science.abg2530</a>","short":"D. Bluvstein, A. Omran, H. Levine, A. Keesling, G. Semeghini, S. Ebadi, T.T. Wang, A. Michailidis, N. Maskara, W.W. Ho, S. Choi, M. Serbyn, M. Greiner, V. Vuletić, M.D. Lukin, Science 371 (2021) 1355–1359.","ieee":"D. Bluvstein <i>et al.</i>, “Controlling quantum many-body dynamics in driven Rydberg atom arrays,” <i>Science</i>, vol. 371, no. 6536. AAAS, pp. 1355–1359, 2021.","ama":"Bluvstein D, Omran A, Levine H, et al. Controlling quantum many-body dynamics in driven Rydberg atom arrays. <i>Science</i>. 2021;371(6536):1355-1359. doi:<a href=\"https://doi.org/10.1126/science.abg2530\">10.1126/science.abg2530</a>","chicago":"Bluvstein, D., A. Omran, H. Levine, A. Keesling, G. Semeghini, S. Ebadi, T. T. Wang, et al. “Controlling Quantum Many-Body Dynamics in Driven Rydberg Atom Arrays.” <i>Science</i>. AAAS, 2021. <a href=\"https://doi.org/10.1126/science.abg2530\">https://doi.org/10.1126/science.abg2530</a>.","ista":"Bluvstein D, Omran A, Levine H, Keesling A, Semeghini G, Ebadi S, Wang TT, Michailidis A, Maskara N, Ho WW, Choi S, Serbyn M, Greiner M, Vuletić V, Lukin MD. 2021. Controlling quantum many-body dynamics in driven Rydberg atom arrays. Science. 371(6536), 1355–1359.","mla":"Bluvstein, D., et al. “Controlling Quantum Many-Body Dynamics in Driven Rydberg Atom Arrays.” <i>Science</i>, vol. 371, no. 6536, AAAS, 2021, pp. 1355–59, doi:<a href=\"https://doi.org/10.1126/science.abg2530\">10.1126/science.abg2530</a>."},"type":"journal_article","ddc":["539"],"article_type":"original","abstract":[{"lang":"eng","text":"The control of nonequilibrium quantum dynamics in many-body systems is challenging because interactions typically lead to thermalization and a chaotic spreading throughout Hilbert space. We investigate nonequilibrium dynamics after rapid quenches in a many-body system composed of 3 to 200 strongly interacting qubits in one and two spatial dimensions. Using a programmable quantum simulator based on Rydberg atom arrays, we show that coherent revivals associated with so-called quantum many-body scars can be stabilized by periodic driving, which generates a robust subharmonic response akin to discrete time-crystalline order. We map Hilbert space dynamics, geometry dependence, phase diagrams, and system-size dependence of this emergent phenomenon, demonstrating new ways to steer complex dynamics in many-body systems and enabling potential applications in quantum information science."}],"publication_status":"published","language":[{"iso":"eng"}],"has_accepted_license":"1","pmid":1,"status":"public","quality_controlled":"1","file_date_updated":"2021-09-23T14:00:05Z","publication":"Science","page":"1355-1359","project":[{"call_identifier":"H2020","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","grant_number":"850899","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"_id":"9618","date_created":"2021-06-29T12:04:05Z","external_id":{"isi":["000636043400048"],"arxiv":["2012.12276"],"pmid":["33632894"]},"date_updated":"2023-08-10T13:57:07Z","title":"Controlling quantum many-body dynamics in driven Rydberg atom arrays","month":"03","date_published":"2021-03-26T00:00:00Z","article_processing_charge":"No","keyword":["Multidisciplinary"],"ec_funded":1,"scopus_import":"1","volume":371,"acknowledgement":"We thank many members of the Harvard AMO community, particularly E. Urbach, S. Dakoulas, and J. Doyle for their efforts enabling safe and productive operation of our laboratories during 2020. We thank D. Abanin, I. Cong, F. Machado, H. Pichler, N. Yao, B. Ye, and H. Zhou for stimulating discussions. Funding: We acknowledge financial support from the Center for Ultracold Atoms, the National Science Foundation, the Vannevar Bush Faculty Fellowship, the U.S. Department of Energy (LBNL QSA Center and grant no. DE-SC0021013), the Office of Naval Research, the Army Research Office MURI, the DARPA DRINQS program (grant no. D18AC00033), and the DARPA ONISQ program (grant no. W911NF2010021). The authors acknowledge support from the NSF Graduate Research Fellowship Program (grant DGE1745303) and The Fannie and John Hertz Foundation (D.B.); a National Defense Science and Engineering Graduate (NDSEG) fellowship (H.L.); a fellowship from the Max Planck/Harvard Research Center for Quantum Optics (G.S.); Gordon College (T.T.W.); the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (grant agreement no. 850899) (A.A.M. and M.S.); a Department of Energy Computational Science Graduate Fellowship under award number DE-SC0021110 (N.M.); the Moore Foundation’s EPiQS Initiative grant no. GBMF4306, the NUS Development grant AY2019/2020, and the Stanford Institute of Theoretical Physics (W.W.H.); and the Miller Institute for Basic Research in Science (S.C.). Author contributions: D.B., A.O., H.L., A.K., G.S., S.E., and T.T.W. contributed to the building of the experimental setup, performed the measurements, and analyzed the data. A.A.M., N.M., W.W.H., S.C., and M.S. performed theoretical analysis. All work was supervised by M.G., V.V., and M.D.L. All authors discussed the results and contributed to the manuscript. Competing interests: M.G., V.V., and M.D.L. are co-founders and shareholders of QuEra Computing. A.O. is a shareholder of QuEra Computing. Data and materials availability: All data needed to evaluate the conclusions in the paper are present in the paper and the supplementary materials.","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"6536","oa":1,"intvolume":"       371"},{"quality_controlled":"1","abstract":[{"lang":"eng","text":"The quantum approximate optimization algorithm (QAOA) is a prospective near-term quantum algorithm due to its modest circuit depth and promising benchmarks. However, an external parameter optimization required in the QAOA could become a performance bottleneck. This motivates studies of the optimization landscape and search for heuristic ways of parameter initialization. In this work we visualize the optimization landscape of the QAOA applied to the MaxCut problem on random graphs, demonstrating that random initialization of the QAOA is prone to converging to local minima with suboptimal performance. We introduce the initialization of QAOA parameters based on the Trotterized quantum annealing (TQA) protocol, parameterized by the Trotter time step. We find that the TQA initialization allows to circumvent\r\nthe issue of false minima for a broad range of time steps, yielding the same performance as the best result out of an exponentially scaling number of random initializations. Moreover, we demonstrate that the optimal value of the time step coincides with the point of proliferation of Trotter errors in quantum annealing. Our results suggest practical ways of initializing QAOA protocols on near-term quantum devices and reveal new connections between QAOA and quantum annealing."}],"publication_status":"published","has_accepted_license":"1","status":"public","language":[{"iso":"eng"}],"ddc":["530"],"article_type":"original","file":[{"file_name":"2021_Quantum_Sack.pdf","access_level":"open_access","relation":"main_file","checksum":"9706c2bb8e748e9b5b138381995a7f6f","file_size":2312482,"content_type":"application/pdf","date_updated":"2021-08-06T06:44:31Z","creator":"cchlebak","date_created":"2021-08-06T06:44:31Z","file_id":"9774"}],"type":"journal_article","citation":{"mla":"Sack, Stefan, and Maksym Serbyn. “Quantum Annealing Initialization of the Quantum Approximate Optimization Algorithm.” <i>Quantum</i>, vol. 5, 491, Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften, 2021, doi:<a href=\"https://doi.org/10.22331/Q-2021-07-01-491\">10.22331/Q-2021-07-01-491</a>.","ista":"Sack S, Serbyn M. 2021. Quantum annealing initialization of the quantum approximate optimization algorithm. Quantum. 5, 491.","ama":"Sack S, Serbyn M. Quantum annealing initialization of the quantum approximate optimization algorithm. <i>Quantum</i>. 2021;5. doi:<a href=\"https://doi.org/10.22331/Q-2021-07-01-491\">10.22331/Q-2021-07-01-491</a>","chicago":"Sack, Stefan, and Maksym Serbyn. “Quantum Annealing Initialization of the Quantum Approximate Optimization Algorithm.” <i>Quantum</i>. Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften, 2021. <a href=\"https://doi.org/10.22331/Q-2021-07-01-491\">https://doi.org/10.22331/Q-2021-07-01-491</a>.","ieee":"S. Sack and M. Serbyn, “Quantum annealing initialization of the quantum approximate optimization algorithm,” <i>Quantum</i>, vol. 5. Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften, 2021.","short":"S. Sack, M. Serbyn, Quantum 5 (2021).","apa":"Sack, S., &#38; Serbyn, M. (2021). Quantum annealing initialization of the quantum approximate optimization algorithm. <i>Quantum</i>. Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften. <a href=\"https://doi.org/10.22331/Q-2021-07-01-491\">https://doi.org/10.22331/Q-2021-07-01-491</a>"},"year":"2021","isi":1,"author":[{"full_name":"Sack, Stefan","orcid":"0000-0001-5400-8508","last_name":"Sack","id":"dd622248-f6e0-11ea-865d-ce382a1c81a5","first_name":"Stefan"},{"first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","last_name":"Serbyn","orcid":"0000-0002-2399-5827","full_name":"Serbyn, Maksym"}],"department":[{"_id":"GradSch"},{"_id":"MaSe"}],"publication_identifier":{"eissn":["2521-327X"]},"tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"publisher":"Verein zur Förderung des Open Access Publizierens in den Quantenwissenschaften","day":"01","doi":"10.22331/Q-2021-07-01-491","arxiv":1,"oa_version":"Published Version","article_number":"491","oa":1,"intvolume":"         5","acknowledgement":"We would like to thank D. Abanin and R. Medina for fruitful discussions and A. Smith and I. Kim for valuable feedback on the manuscript. We acknowledge support by the European Research Council (ERC) under the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899).","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","related_material":{"record":[{"relation":"dissertation_contains","status":"public","id":"14622"}]},"volume":5,"scopus_import":"1","article_processing_charge":"Yes","date_published":"2021-07-01T00:00:00Z","ec_funded":1,"date_updated":"2023-12-13T14:47:25Z","title":"Quantum annealing initialization of the quantum approximate optimization algorithm","month":"07","_id":"9760","project":[{"call_identifier":"H2020","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"external_id":{"isi":["000669830600001"],"arxiv":["2101.05742"]},"date_created":"2021-08-01T22:01:21Z","publication":"Quantum","file_date_updated":"2021-08-06T06:44:31Z"},{"day":"06","publisher":"American Physical Society","oa_version":"Published Version","arxiv":1,"doi":"10.1103/physrevlett.127.060602","author":[{"first_name":"Volker","id":"D7C012AE-D7ED-11E9-95E8-1EC5E5697425","last_name":"Karle","full_name":"Karle, Volker","orcid":"0000-0002-6963-0129"},{"first_name":"Maksym","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","orcid":"0000-0002-2399-5827","full_name":"Serbyn, Maksym","last_name":"Serbyn"},{"last_name":"Michailidis","orcid":"0000-0002-8443-1064","full_name":"Michailidis, Alexios","first_name":"Alexios","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87"}],"isi":1,"year":"2021","tmp":{"image":"/images/cc_by.png","short":"CC BY (4.0)","name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"publication_identifier":{"eissn":["1079-7114"],"issn":["0031-9007"]},"department":[{"_id":"MaSe"},{"_id":"GradSch"},{"_id":"MiLe"}],"article_type":"letter_note","ddc":["539"],"type":"journal_article","citation":{"ieee":"V. Karle, M. Serbyn, and A. Michailidis, “Area-law entangled eigenstates from nullspaces of local Hamiltonians,” <i>Physical Review Letters</i>, vol. 127, no. 6. American Physical Society, 2021.","apa":"Karle, V., Serbyn, M., &#38; Michailidis, A. (2021). Area-law entangled eigenstates from nullspaces of local Hamiltonians. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/physrevlett.127.060602\">https://doi.org/10.1103/physrevlett.127.060602</a>","short":"V. Karle, M. Serbyn, A. Michailidis, Physical Review Letters 127 (2021).","ista":"Karle V, Serbyn M, Michailidis A. 2021. Area-law entangled eigenstates from nullspaces of local Hamiltonians. Physical Review Letters. 127(6), 060602.","mla":"Karle, Volker, et al. “Area-Law Entangled Eigenstates from Nullspaces of Local Hamiltonians.” <i>Physical Review Letters</i>, vol. 127, no. 6, 060602, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/physrevlett.127.060602\">10.1103/physrevlett.127.060602</a>.","ama":"Karle V, Serbyn M, Michailidis A. Area-law entangled eigenstates from nullspaces of local Hamiltonians. <i>Physical Review Letters</i>. 2021;127(6). doi:<a href=\"https://doi.org/10.1103/physrevlett.127.060602\">10.1103/physrevlett.127.060602</a>","chicago":"Karle, Volker, Maksym Serbyn, and Alexios Michailidis. “Area-Law Entangled Eigenstates from Nullspaces of Local Hamiltonians.” <i>Physical Review Letters</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/physrevlett.127.060602\">https://doi.org/10.1103/physrevlett.127.060602</a>."},"file":[{"file_id":"9904","date_created":"2021-08-13T09:28:08Z","creator":"mserbyn","relation":"main_file","checksum":"51218f302dcef99d90d1209809fcc874","date_updated":"2021-08-13T09:28:08Z","content_type":"application/pdf","file_size":5064231,"file_name":"PhysRevLett.127.060602_SOM.pdf","success":1,"access_level":"open_access"}],"quality_controlled":"1","language":[{"iso":"eng"}],"has_accepted_license":"1","status":"public","publication_status":"published","abstract":[{"lang":"eng","text":"Eigenstate thermalization in quantum many-body systems implies that eigenstates at high energy are similar to random vectors. Identifying systems where at least some eigenstates are nonthermal is an outstanding question. In this Letter we show that interacting quantum models that have a nullspace—a degenerate subspace of eigenstates at zero energy (zero modes), which corresponds to infinite temperature, provide a route to nonthermal eigenstates. We analytically show the existence of a zero mode which can be represented as a matrix product state for a certain class of local Hamiltonians. In the more general case we use a subspace disentangling algorithm to generate an orthogonal basis of zero modes characterized by increasing entanglement entropy. We show evidence for an area-law entanglement scaling of the least-entangled zero mode in the broad parameter regime, leading to a conjecture that all local Hamiltonians with the nullspace feature zero modes with area-law entanglement scaling and, as such, break the strong thermalization hypothesis. Finally, we find zero modes in constrained models and propose a setup for observing their experimental signatures."}],"date_created":"2021-08-13T09:27:39Z","external_id":{"isi":["000684276000002"],"arxiv":["2102.13633"]},"_id":"9903","project":[{"name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","call_identifier":"H2020"}],"file_date_updated":"2021-08-13T09:28:08Z","publication":"Physical Review Letters","ec_funded":1,"date_published":"2021-08-06T00:00:00Z","article_processing_charge":"Yes (in subscription journal)","month":"08","title":"Area-law entangled eigenstates from nullspaces of local Hamiltonians","date_updated":"2023-08-11T10:43:27Z","acknowledgement":"We acknowledge useful discussions with V. Gritsev and A. Garkun and suggestions on implementation of the\r\nPPXPP model by D. Bluvstein. A. M. and M. S. were supported by the European Research Council (ERC) under\r\nthe European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 850899)","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","issue":"6","oa":1,"intvolume":"       127","article_number":"060602","volume":127},{"year":"2021","isi":1,"author":[{"full_name":"Maskara, N.","last_name":"Maskara","first_name":"N."},{"last_name":"Michailidis","orcid":"0000-0002-8443-1064","full_name":"Michailidis, Alexios","id":"36EBAD38-F248-11E8-B48F-1D18A9856A87","first_name":"Alexios"},{"last_name":"Ho","full_name":"Ho, W. W.","first_name":"W. W."},{"last_name":"Bluvstein","full_name":"Bluvstein, D.","first_name":"D."},{"first_name":"S.","full_name":"Choi, S.","last_name":"Choi"},{"first_name":"M. D.","last_name":"Lukin","full_name":"Lukin, M. D."},{"last_name":"Serbyn","full_name":"Serbyn, Maksym","orcid":"0000-0002-2399-5827","id":"47809E7E-F248-11E8-B48F-1D18A9856A87","first_name":"Maksym"}],"publication_identifier":{"eissn":["1079-7114"],"issn":["0031-9007"]},"department":[{"_id":"MaSe"}],"day":"27","publisher":"American Physical Society","arxiv":1,"oa_version":"Submitted Version","doi":"10.1103/PhysRevLett.127.090602","quality_controlled":"1","status":"public","language":[{"iso":"eng"}],"publication_status":"published","abstract":[{"text":"The control of many-body quantum dynamics in complex systems is a key challenge in the quest to reliably produce and manipulate large-scale quantum entangled states. Recently, quench experiments in Rydberg atom arrays [Bluvstein et al. Science 371, 1355 (2021)] demonstrated that coherent revivals associated with quantum many-body scars can be stabilized by periodic driving, generating stable subharmonic responses over a wide parameter regime. We analyze a simple, related model where these phenomena originate from spatiotemporal ordering in an effective Floquet unitary, corresponding to discrete time-crystalline behavior in a prethermal regime. Unlike conventional discrete time crystals, the subharmonic response exists only for Néel-like initial states, associated with quantum scars. We predict robustness to perturbations and identify emergent timescales that could be observed in future experiments. Our results suggest a route to controlling entanglement in interacting quantum systems by combining periodic driving with many-body scars.","lang":"eng"}],"article_type":"letter_note","citation":{"ieee":"N. Maskara <i>et al.</i>, “Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving,” <i>Physical Review Letters</i>, vol. 127, no. 9. American Physical Society, 2021.","apa":"Maskara, N., Michailidis, A., Ho, W. W., Bluvstein, D., Choi, S., Lukin, M. D., &#38; Serbyn, M. (2021). Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving. <i>Physical Review Letters</i>. American Physical Society. <a href=\"https://doi.org/10.1103/PhysRevLett.127.090602\">https://doi.org/10.1103/PhysRevLett.127.090602</a>","short":"N. Maskara, A. Michailidis, W.W. Ho, D. Bluvstein, S. Choi, M.D. Lukin, M. Serbyn, Physical Review Letters 127 (2021).","ista":"Maskara N, Michailidis A, Ho WW, Bluvstein D, Choi S, Lukin MD, Serbyn M. 2021. Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving. Physical Review Letters. 127(9), 090602.","mla":"Maskara, N., et al. “Discrete Time-Crystalline Order Enabled by Quantum Many-Body Scars: Entanglement Steering via Periodic Driving.” <i>Physical Review Letters</i>, vol. 127, no. 9, 090602, American Physical Society, 2021, doi:<a href=\"https://doi.org/10.1103/PhysRevLett.127.090602\">10.1103/PhysRevLett.127.090602</a>.","ama":"Maskara N, Michailidis A, Ho WW, et al. Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving. <i>Physical Review Letters</i>. 2021;127(9). doi:<a href=\"https://doi.org/10.1103/PhysRevLett.127.090602\">10.1103/PhysRevLett.127.090602</a>","chicago":"Maskara, N., Alexios Michailidis, W. W. Ho, D. Bluvstein, S. Choi, M. D. Lukin, and Maksym Serbyn. “Discrete Time-Crystalline Order Enabled by Quantum Many-Body Scars: Entanglement Steering via Periodic Driving.” <i>Physical Review Letters</i>. American Physical Society, 2021. <a href=\"https://doi.org/10.1103/PhysRevLett.127.090602\">https://doi.org/10.1103/PhysRevLett.127.090602</a>."},"type":"journal_article","ec_funded":1,"article_processing_charge":"No","date_published":"2021-08-27T00:00:00Z","month":"08","date_updated":"2023-08-11T10:57:51Z","title":"Discrete time-crystalline order enabled by quantum many-body scars: Entanglement steering via periodic driving","external_id":{"isi":["000692200100002"],"arxiv":["2102.13160"]},"date_created":"2021-08-28T08:08:58Z","_id":"9960","project":[{"call_identifier":"H2020","grant_number":"850899","_id":"23841C26-32DE-11EA-91FC-C7463DDC885E","name":"Non-Ergodic Quantum Matter: Universality, Dynamics and Control"}],"publication":"Physical Review Letters","intvolume":"       127","oa":1,"issue":"9","acknowledgement":"We thank Dmitry Abanin, Ehud Altman, Iris Cong, Sepehr Ebadi, Alex Keesling, Harry Levine, Ahmed Omran, Hannes Pichler, Rhine Samajdar, Guilia Semeghini, Tout Wang, Norman Yao, and Harry Zhou or stimulating discussions. We acknowledge support from the Center for Ultracold Atoms, the National Science Foundation, the Vannevar Bush Faculty Fellowship, the U.S. Department of Energy, the Army Research Office MURI, and the DARPA ONISQ program (M. L., N. M, W. W. H., D. B.); the European Research Council (ERC) under the European Union’s Horizon 2020 Research and Innovation Programme Grant Agreement No. 850899 (A. M. and M. S.); the Department of Energy Computational Science Graduate Fellowship under Awards No. DESC0021110 (N. M.); the Moore Foundation EPiQS initiative Grant No. GBMF4306, the National University of Singapore (NUS) Development Grant AY2019/2020 and the Stanford Institute for Theoretical Physics (W. W. H.); the NSF Graduate Research Fellowship Program (Grant No. DGE1745303) and The Fannie and John Hertz Foundation (D. B.); the Miller Institute for Basic Research in Science (S. C.); DOE Quantum Systems Accelerator – Contract No. 7568717; and DOE Programmable Quantum Simulators for Lattice Gauge Theories and Gauge-Gravity Correspondence – Grant No. DE-SC0021013.","user_id":"4359f0d1-fa6c-11eb-b949-802e58b17ae8","article_number":"090602","main_file_link":[{"url":"https://arxiv.org/abs/2102.13160","open_access":"1"}],"volume":127}]