{"day":"05","article_number":"3968","has_accepted_license":"1","article_processing_charge":"No","isi":1,"language":[{"iso":"eng"}],"date_created":"2023-07-16T22:01:08Z","pmid":1,"acknowledged_ssus":[{"_id":"M-Shop"},{"_id":"NanoFab"}],"abstract":[{"lang":"eng","text":"Currently available quantum processors are dominated by noise, which severely limits their applicability and motivates the search for new physical qubit encodings. In this work, we introduce the inductively shunted transmon, a weakly flux-tunable superconducting qubit that offers charge offset protection for all levels and a 20-fold reduction in flux dispersion compared to the state-of-the-art resulting in a constant coherence over a full flux quantum. The parabolic confinement provided by the inductive shunt as well as the linearity of the geometric superinductor facilitates a high-power readout that resolves quantum jumps with a fidelity and QND-ness of >90% and without the need for a Josephson parametric amplifier. Moreover, the device reveals quantum tunneling physics between the two prepared fluxon ground states with a measured average decay time of up to 3.5 h. In the future, fast time-domain control of the transition matrix elements could offer a new path forward to also achieve full qubit control in the decay-protected fluxon basis."}],"acknowledgement":"The authors thank J. Koch for discussions and support with the scQubits python package, I. Rozhansky and A. Poddubny for important insights into photon-assisted tunneling, S. Barzanjeh and G. Arnold for theory, E. Redchenko, S. Pepic, the MIBA workshop and the IST nanofabrication facility for technical contributions, as well as L. Drmic, P. Zielinski and R. Sett for software development. We acknowledge the prompt support of Quantum Machines to implement active state preparation with their OPX+. This work was supported by a NOMIS foundation research grant (J.F.), the Austrian Science Fund (FWF) through BeyondC F7105 (J.F.) and IST Austria.","file_date_updated":"2023-07-18T08:43:07Z","doi":"10.1038/s41467-023-39656-2","file":[{"relation":"main_file","access_level":"open_access","checksum":"a85773b5fe23516f60f7d5d31b55c200","file_id":"13248","content_type":"application/pdf","file_name":"2023_NatureComm_Hassani.pdf","success":1,"date_updated":"2023-07-18T08:43:07Z","file_size":2899592,"date_created":"2023-07-18T08:43:07Z","creator":"dernst"}],"publisher":"Springer Nature","oa":1,"type":"journal_article","author":[{"full_name":"Hassani, Farid","orcid":"0000-0001-6937-5773","id":"2AED110C-F248-11E8-B48F-1D18A9856A87","last_name":"Hassani","first_name":"Farid"},{"last_name":"Peruzzo","id":"3F920B30-F248-11E8-B48F-1D18A9856A87","first_name":"Matilda","orcid":"0000-0002-3415-4628","full_name":"Peruzzo, Matilda"},{"id":"84b9700b-15b2-11ec-abd3-831089e67615","last_name":"Kapoor","first_name":"Lucky","full_name":"Kapoor, Lucky"},{"last_name":"Trioni","id":"42F71B44-F248-11E8-B48F-1D18A9856A87","first_name":"Andrea","full_name":"Trioni, Andrea"},{"full_name":"Zemlicka, Martin","last_name":"Zemlicka","id":"2DCF8DE6-F248-11E8-B48F-1D18A9856A87","first_name":"Martin"},{"full_name":"Fink, Johannes M","orcid":"0000-0001-8112-028X","id":"4B591CBA-F248-11E8-B48F-1D18A9856A87","last_name":"Fink","first_name":"Johannes M"}],"tmp":{"name":"Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)","short":"CC BY (4.0)","image":"/images/cc_by.png","legal_code_url":"https://creativecommons.org/licenses/by/4.0/legalcode"},"intvolume":"        14","publication_identifier":{"eissn":["2041-1723"]},"date_published":"2023-07-05T00:00:00Z","date_updated":"2023-12-13T11:32:25Z","quality_controlled":"1","publication_status":"published","scopus_import":"1","article_type":"original","year":"2023","project":[{"call_identifier":"FWF","grant_number":"F07105","name":"Integrating superconducting quantum circuits","_id":"26927A52-B435-11E9-9278-68D0E5697425"},{"name":"Hybrid Semiconductor - Superconductor Quantum Devices","_id":"2622978C-B435-11E9-9278-68D0E5697425"}],"volume":14,"ddc":["530"],"publication":"Nature Communications","status":"public","oa_version":"Published Version","user_id":"2DF688A6-F248-11E8-B48F-1D18A9856A87","title":"Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours","external_id":{"isi":["001024729900009"],"pmid":["37407570"]},"department":[{"_id":"JoFi"}],"month":"07","citation":{"apa":"Hassani, F., Peruzzo, M., Kapoor, L., Trioni, A., Zemlicka, M., &#38; Fink, J. M. (2023). Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours. <i>Nature Communications</i>. Springer Nature. <a href=\"https://doi.org/10.1038/s41467-023-39656-2\">https://doi.org/10.1038/s41467-023-39656-2</a>","mla":"Hassani, Farid, et al. “Inductively Shunted Transmons Exhibit Noise Insensitive Plasmon States and a Fluxon Decay Exceeding 3 Hours.” <i>Nature Communications</i>, vol. 14, 3968, Springer Nature, 2023, doi:<a href=\"https://doi.org/10.1038/s41467-023-39656-2\">10.1038/s41467-023-39656-2</a>.","ama":"Hassani F, Peruzzo M, Kapoor L, Trioni A, Zemlicka M, Fink JM. Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours. <i>Nature Communications</i>. 2023;14. doi:<a href=\"https://doi.org/10.1038/s41467-023-39656-2\">10.1038/s41467-023-39656-2</a>","ista":"Hassani F, Peruzzo M, Kapoor L, Trioni A, Zemlicka M, Fink JM. 2023. Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours. Nature Communications. 14, 3968.","ieee":"F. Hassani, M. Peruzzo, L. Kapoor, A. Trioni, M. Zemlicka, and J. M. Fink, “Inductively shunted transmons exhibit noise insensitive plasmon states and a fluxon decay exceeding 3 hours,” <i>Nature Communications</i>, vol. 14. Springer Nature, 2023.","chicago":"Hassani, Farid, Matilda Peruzzo, Lucky Kapoor, Andrea Trioni, Martin Zemlicka, and Johannes M Fink. “Inductively Shunted Transmons Exhibit Noise Insensitive Plasmon States and a Fluxon Decay Exceeding 3 Hours.” <i>Nature Communications</i>. Springer Nature, 2023. <a href=\"https://doi.org/10.1038/s41467-023-39656-2\">https://doi.org/10.1038/s41467-023-39656-2</a>.","short":"F. Hassani, M. Peruzzo, L. Kapoor, A. Trioni, M. Zemlicka, J.M. Fink, Nature Communications 14 (2023)."},"_id":"13227"}