---
_id: '15004'
abstract:
- lang: eng
  text: The impulsive limit (the “sudden approximation”) has been widely employed
    to describe the interaction between molecules and short, far-off-resonant laser
    pulses. This approximation assumes that the timescale of the laser-molecule interaction
    is significantly shorter than the internal rotational period of the molecule,
    resulting in the rotational motion being instantaneously “frozen” during the interaction.
    This simplified description of the laser-molecule interaction is incorporated
    in various theoretical models predicting rotational dynamics of molecules driven
    by short laser pulses. In this theoretical work, we develop an effective theory
    for ultrashort laser pulses by examining the full time-evolution operator and
    solving the time-dependent Schrödinger equation at the operator level. Our findings
    reveal a critical angular momentum, lcrit, at which the impulsive limit breaks
    down. In other words, the validity of the sudden approximation depends not only
    on the pulse duration but also on its intensity, since the latter determines how
    many angular momentum states are populated. We explore both ultrashort multicycle
    (Gaussian) pulses and the somewhat less studied half-cycle pulses, which produce
    distinct effective potentials. We discuss the limitations of the impulsive limit
    and propose a method that rescales the effective matrix elements, enabling an
    improved and more accurate description of laser-molecule interactions.
acknowledgement: We thank Bretislav Friedrich, Marjan Mirahmadi, Artem Volosniev,
  and Burkhard Schmidt for insightful discussions. M.L. acknowledges support by the
  European Research Council (ERC) under Starting Grant No. 801770 (ANGULON).
article_number: '023101'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Volker
  full_name: Karle, Volker
  id: D7C012AE-D7ED-11E9-95E8-1EC5E5697425
  last_name: Karle
  orcid: 0000-0002-6963-0129
- first_name: Mikhail
  full_name: Lemeshko, Mikhail
  id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
  last_name: Lemeshko
  orcid: 0000-0002-6990-7802
citation:
  ama: 'Karle V, Lemeshko M. Modeling laser pulses as δ kicks: Reevaluating the impulsive
    limit in molecular rotational dynamics. <i>Physical Review A</i>. 2024;109(2).
    doi:<a href="https://doi.org/10.1103/PhysRevA.109.023101">10.1103/PhysRevA.109.023101</a>'
  apa: 'Karle, V., &#38; Lemeshko, M. (2024). Modeling laser pulses as δ kicks: Reevaluating
    the impulsive limit in molecular rotational dynamics. <i>Physical Review A</i>.
    American Physical Society. <a href="https://doi.org/10.1103/PhysRevA.109.023101">https://doi.org/10.1103/PhysRevA.109.023101</a>'
  chicago: 'Karle, Volker, and Mikhail Lemeshko. “Modeling Laser Pulses as δ Kicks:
    Reevaluating the Impulsive Limit in Molecular Rotational Dynamics.” <i>Physical
    Review A</i>. American Physical Society, 2024. <a href="https://doi.org/10.1103/PhysRevA.109.023101">https://doi.org/10.1103/PhysRevA.109.023101</a>.'
  ieee: 'V. Karle and M. Lemeshko, “Modeling laser pulses as δ kicks: Reevaluating
    the impulsive limit in molecular rotational dynamics,” <i>Physical Review A</i>,
    vol. 109, no. 2. American Physical Society, 2024.'
  ista: 'Karle V, Lemeshko M. 2024. Modeling laser pulses as δ kicks: Reevaluating
    the impulsive limit in molecular rotational dynamics. Physical Review A. 109(2),
    023101.'
  mla: 'Karle, Volker, and Mikhail Lemeshko. “Modeling Laser Pulses as δ Kicks: Reevaluating
    the Impulsive Limit in Molecular Rotational Dynamics.” <i>Physical Review A</i>,
    vol. 109, no. 2, 023101, American Physical Society, 2024, doi:<a href="https://doi.org/10.1103/PhysRevA.109.023101">10.1103/PhysRevA.109.023101</a>.'
  short: V. Karle, M. Lemeshko, Physical Review A 109 (2024).
date_created: 2024-02-18T23:01:01Z
date_published: 2024-02-01T00:00:00Z
date_updated: 2024-02-26T09:45:20Z
day: '01'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.109.023101
ec_funded: 1
external_id:
  arxiv:
  - '2307.07256'
intvolume: '       109'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.48550/arXiv.2307.07256
month: '02'
oa: 1
oa_version: Preprint
project:
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '801770'
  name: 'Angulon: physics and applications of a new quasiparticle'
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Modeling laser pulses as δ kicks: Reevaluating the impulsive limit in molecular
  rotational dynamics'
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 109
year: '2024'
...
---
_id: '14553'
abstract:
- lang: eng
  text: Quantum state tomography is an essential component of modern quantum technology.
    In application to continuous-variable harmonic-oscillator systems, such as the
    electromagnetic field, existing tomography methods typically reconstruct the state
    in discrete bases, and are hence limited to states with relatively low amplitudes
    and energies. Here, we overcome this limitation by utilizing a feed-forward neural
    network to obtain the density matrix directly in the continuous position basis.
    An important benefit of our approach is the ability to choose specific regions
    in the phase space for detailed reconstruction. This results in a relatively slow
    scaling of the amount of resources required for the reconstruction with the state
    amplitude, and hence allows us to dramatically increase the range of amplitudes
    accessible with our method.
article_number: '042430'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Ekaterina
  full_name: Fedotova, Ekaterina
  id: c1bea5e1-878e-11ee-9dff-d7404e4422ab
  last_name: Fedotova
  orcid: 0000-0001-7242-015X
- first_name: Nikolai
  full_name: Kuznetsov, Nikolai
  last_name: Kuznetsov
- first_name: Egor
  full_name: Tiunov, Egor
  last_name: Tiunov
- first_name: A. E.
  full_name: Ulanov, A. E.
  last_name: Ulanov
- first_name: A. I.
  full_name: Lvovsky, A. I.
  last_name: Lvovsky
citation:
  ama: Fedotova E, Kuznetsov N, Tiunov E, Ulanov AE, Lvovsky AI. Continuous-variable
    quantum tomography of high-amplitude states. <i>Physical Review A</i>. 2023;108(4).
    doi:<a href="https://doi.org/10.1103/PhysRevA.108.042430">10.1103/PhysRevA.108.042430</a>
  apa: Fedotova, E., Kuznetsov, N., Tiunov, E., Ulanov, A. E., &#38; Lvovsky, A. I.
    (2023). Continuous-variable quantum tomography of high-amplitude states. <i>Physical
    Review A</i>. American Physical Society. <a href="https://doi.org/10.1103/PhysRevA.108.042430">https://doi.org/10.1103/PhysRevA.108.042430</a>
  chicago: Fedotova, Ekaterina, Nikolai Kuznetsov, Egor Tiunov, A. E. Ulanov, and
    A. I. Lvovsky. “Continuous-Variable Quantum Tomography of High-Amplitude States.”
    <i>Physical Review A</i>. American Physical Society, 2023. <a href="https://doi.org/10.1103/PhysRevA.108.042430">https://doi.org/10.1103/PhysRevA.108.042430</a>.
  ieee: E. Fedotova, N. Kuznetsov, E. Tiunov, A. E. Ulanov, and A. I. Lvovsky, “Continuous-variable
    quantum tomography of high-amplitude states,” <i>Physical Review A</i>, vol. 108,
    no. 4. American Physical Society, 2023.
  ista: Fedotova E, Kuznetsov N, Tiunov E, Ulanov AE, Lvovsky AI. 2023. Continuous-variable
    quantum tomography of high-amplitude states. Physical Review A. 108(4), 042430.
  mla: Fedotova, Ekaterina, et al. “Continuous-Variable Quantum Tomography of High-Amplitude
    States.” <i>Physical Review A</i>, vol. 108, no. 4, 042430, American Physical
    Society, 2023, doi:<a href="https://doi.org/10.1103/PhysRevA.108.042430">10.1103/PhysRevA.108.042430</a>.
  short: E. Fedotova, N. Kuznetsov, E. Tiunov, A.E. Ulanov, A.I. Lvovsky, Physical
    Review A 108 (2023).
date_created: 2023-11-19T23:00:54Z
date_published: 2023-10-30T00:00:00Z
date_updated: 2023-11-20T10:26:51Z
day: '30'
department:
- _id: JoFi
doi: 10.1103/PhysRevA.108.042430
external_id:
  arxiv:
  - '2212.07406'
intvolume: '       108'
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.48550/arXiv.2212.07406
month: '10'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Continuous-variable quantum tomography of high-amplitude states
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 108
year: '2023'
...
---
_id: '13125'
abstract:
- lang: eng
  text: 'The quantum approximate optimization algorithm (QAOA) is a variational quantum
    algorithm, where a quantum computer implements a variational ansatz consisting
    of p layers of alternating unitary operators and a classical computer is used
    to optimize the variational parameters. For a random initialization, the optimization
    typically leads to local minima with poor performance, motivating the search for
    initialization strategies of QAOA variational parameters. Although numerous heuristic
    initializations exist, an analytical understanding and performance guarantees
    for large p remain evasive.We introduce a greedy initialization of QAOA which
    guarantees improving performance with an increasing number of layers. Our main
    result is an analytic construction of 2p + 1 transition states—saddle points with
    a unique negative curvature direction—for QAOA with p + 1 layers that use the
    local minimum of QAOA with p layers. Transition states connect to new local minima,
    which are guaranteed to lower the energy compared to the minimum found for p layers.
    We use the GREEDY procedure to navigate the exponentially increasing with p number
    of local minima resulting from the recursive application of our analytic construction.
    The performance of the GREEDY procedure matches available initialization strategies
    while providing a guarantee for the minimal energy to decrease with an increasing
    number of layers p. '
acknowledgement: 'We thank V. Verteletskyi for a joint collaboration on numerical
  studies of the QAOA during his internship at ISTA that inspired analytic results
  on TS reported in this work. We acknowledge A. A. Mele and M. Brooks for discussions
  and D. Egger, P. Love, and D. Wierichs for valuable feedback on the manuscript.
  S.H.S., R.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). R.K. is supported by the SFB BeyondC (Grant No. F7107-N38) and the
  project QuantumReady (FFG 896217). '
article_number: '062404'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Stefan
  full_name: Sack, Stefan
  id: dd622248-f6e0-11ea-865d-ce382a1c81a5
  last_name: Sack
  orcid: 0000-0001-5400-8508
- first_name: Raimel A
  full_name: Medina Ramos, Raimel A
  id: CE680B90-D85A-11E9-B684-C920E6697425
  last_name: Medina Ramos
  orcid: 0000-0002-5383-2869
- first_name: Richard
  full_name: Kueng, Richard
  last_name: Kueng
- first_name: Maksym
  full_name: Serbyn, Maksym
  id: 47809E7E-F248-11E8-B48F-1D18A9856A87
  last_name: Serbyn
  orcid: 0000-0002-2399-5827
citation:
  ama: Sack S, Medina Ramos RA, Kueng R, Serbyn M. Recursive greedy initialization
    of the quantum approximate optimization algorithm with guaranteed improvement.
    <i>Physical Review A</i>. 2023;107(6). doi:<a href="https://doi.org/10.1103/physreva.107.062404">10.1103/physreva.107.062404</a>
  apa: Sack, S., Medina Ramos, R. A., Kueng, R., &#38; Serbyn, M. (2023). Recursive
    greedy initialization of the quantum approximate optimization algorithm with guaranteed
    improvement. <i>Physical Review A</i>. American Physical Society. <a href="https://doi.org/10.1103/physreva.107.062404">https://doi.org/10.1103/physreva.107.062404</a>
  chicago: Sack, Stefan, Raimel A Medina Ramos, Richard Kueng, and Maksym Serbyn.
    “Recursive Greedy Initialization of the Quantum Approximate Optimization Algorithm
    with Guaranteed Improvement.” <i>Physical Review A</i>. American Physical Society,
    2023. <a href="https://doi.org/10.1103/physreva.107.062404">https://doi.org/10.1103/physreva.107.062404</a>.
  ieee: S. Sack, R. A. Medina Ramos, R. Kueng, and M. Serbyn, “Recursive greedy initialization
    of the quantum approximate optimization algorithm with guaranteed improvement,”
    <i>Physical Review A</i>, vol. 107, no. 6. American Physical Society, 2023.
  ista: Sack S, Medina Ramos RA, Kueng R, Serbyn M. 2023. Recursive greedy initialization
    of the quantum approximate optimization algorithm with guaranteed improvement.
    Physical Review A. 107(6), 062404.
  mla: Sack, Stefan, et al. “Recursive Greedy Initialization of the Quantum Approximate
    Optimization Algorithm with Guaranteed Improvement.” <i>Physical Review A</i>,
    vol. 107, no. 6, 062404, American Physical Society, 2023, doi:<a href="https://doi.org/10.1103/physreva.107.062404">10.1103/physreva.107.062404</a>.
  short: S. Sack, R.A. Medina Ramos, R. Kueng, M. Serbyn, Physical Review A 107 (2023).
date_created: 2023-06-07T06:57:32Z
date_published: 2023-06-02T00:00:00Z
date_updated: 2023-12-13T14:47:25Z
day: '02'
ddc:
- '530'
department:
- _id: MaSe
doi: 10.1103/physreva.107.062404
ec_funded: 1
external_id:
  arxiv:
  - '2209.01159'
  isi:
  - '001016927100012'
file:
- access_level: open_access
  checksum: 0d71423888eeccaa60d8f41197f26306
  content_type: application/pdf
  creator: dernst
  date_created: 2023-06-13T07:28:36Z
  date_updated: 2023-06-13T07:28:36Z
  file_id: '13131'
  file_name: 2023_PhysRevA_Sack.pdf
  file_size: 2524611
  relation: main_file
  success: 1
file_date_updated: 2023-06-13T07:28:36Z
has_accepted_license: '1'
intvolume: '       107'
isi: 1
issue: '6'
language:
- iso: eng
license: https://creativecommons.org/licenses/by/4.0/
month: '06'
oa: 1
oa_version: Published Version
project:
- _id: 23841C26-32DE-11EA-91FC-C7463DDC885E
  call_identifier: H2020
  grant_number: '850899'
  name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control'
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
related_material:
  record:
  - id: '14622'
    relation: dissertation_contains
    status: public
scopus_import: '1'
status: public
title: Recursive greedy initialization of the quantum approximate optimization algorithm
  with guaranteed improvement
tmp:
  image: /images/cc_by.png
  legal_code_url: https://creativecommons.org/licenses/by/4.0/legalcode
  name: Creative Commons Attribution 4.0 International Public License (CC-BY 4.0)
  short: CC BY (4.0)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...
---
_id: '13233'
abstract:
- lang: eng
  text: We study the impact of finite-range physics on the zero-range-model analysis
    of three-body recombination in ultracold atoms. We find that temperature dependence
    of the zero-range parameters can vary from one set of measurements to another
    as it may be driven by the distribution of error bars in the experiment, and not
    by the underlying three-body physics. To study finite-temperature effects in three-body
    recombination beyond the zero-range physics, we introduce and examine a finite-range
    model based upon a hyperspherical formalism. The systematic error discussed in
    this Letter may provide a significant contribution to the error bars of measured
    three-body parameters.
acknowledgement: We thank Jan Arlt, Hans-Werner Hammer, and Karsten Riisager for useful
  discussions. M.L. acknowledges support by the European Research Council (ERC) Starting
  Grant No. 801770 (ANGULON).
article_number: L061304
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Sofya
  full_name: Agafonova, Sofya
  id: 09501ff6-dca7-11ea-a8ae-b3e0b9166e80
  last_name: Agafonova
- first_name: Mikhail
  full_name: Lemeshko, Mikhail
  id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
  last_name: Lemeshko
  orcid: 0000-0002-6990-7802
- first_name: Artem
  full_name: Volosniev, Artem
  id: 37D278BC-F248-11E8-B48F-1D18A9856A87
  last_name: Volosniev
  orcid: 0000-0003-0393-5525
citation:
  ama: Agafonova S, Lemeshko M, Volosniev A. Finite-range bias in fitting three-body
    loss to the zero-range model. <i>Physical Review A</i>. 2023;107(6). doi:<a href="https://doi.org/10.1103/PhysRevA.107.L061304">10.1103/PhysRevA.107.L061304</a>
  apa: Agafonova, S., Lemeshko, M., &#38; Volosniev, A. (2023). Finite-range bias
    in fitting three-body loss to the zero-range model. <i>Physical Review A</i>.
    American Physical Society. <a href="https://doi.org/10.1103/PhysRevA.107.L061304">https://doi.org/10.1103/PhysRevA.107.L061304</a>
  chicago: Agafonova, Sofya, Mikhail Lemeshko, and Artem Volosniev. “Finite-Range
    Bias in Fitting Three-Body Loss to the Zero-Range Model.” <i>Physical Review A</i>.
    American Physical Society, 2023. <a href="https://doi.org/10.1103/PhysRevA.107.L061304">https://doi.org/10.1103/PhysRevA.107.L061304</a>.
  ieee: S. Agafonova, M. Lemeshko, and A. Volosniev, “Finite-range bias in fitting
    three-body loss to the zero-range model,” <i>Physical Review A</i>, vol. 107,
    no. 6. American Physical Society, 2023.
  ista: Agafonova S, Lemeshko M, Volosniev A. 2023. Finite-range bias in fitting three-body
    loss to the zero-range model. Physical Review A. 107(6), L061304.
  mla: Agafonova, Sofya, et al. “Finite-Range Bias in Fitting Three-Body Loss to the
    Zero-Range Model.” <i>Physical Review A</i>, vol. 107, no. 6, L061304, American
    Physical Society, 2023, doi:<a href="https://doi.org/10.1103/PhysRevA.107.L061304">10.1103/PhysRevA.107.L061304</a>.
  short: S. Agafonova, M. Lemeshko, A. Volosniev, Physical Review A 107 (2023).
date_created: 2023-07-16T22:01:10Z
date_published: 2023-06-20T00:00:00Z
date_updated: 2023-08-02T06:31:52Z
day: '20'
department:
- _id: MiLe
- _id: OnHo
doi: 10.1103/PhysRevA.107.L061304
ec_funded: 1
external_id:
  arxiv:
  - '2302.01022'
  isi:
  - '001019748000005'
intvolume: '       107'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.48550/arXiv.2302.01022
month: '06'
oa: 1
oa_version: Preprint
project:
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '801770'
  name: 'Angulon: physics and applications of a new quasiparticle'
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Finite-range bias in fitting three-body loss to the zero-range model
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...
---
_id: '12819'
abstract:
- lang: eng
  text: 'Reaching a high cavity population with a coherent pump in the strong-coupling
    regime of a single-atom laser is impossible due to the photon blockade effect.
    In this Letter, we experimentally demonstrate that in a single-atom maser based
    on a transmon strongly coupled to two resonators, it is possible to pump over
    a dozen photons into the system. The first high-quality resonator plays the role
    of a usual lasing cavity, and the second one presents a controlled dissipation
    channel, bolstering population inversion, and modifies the energy-level structure
    to lift the blockade. As confirmation of the lasing action, we observe conventional
    laser features such as a narrowing of the emission linewidth and external signal
    amplification. Additionally, we report unique single-atom features: self-quenching
    and several lasing thresholds.'
acknowledgement: We thank N.N. Abramov for assistance with the experimental setup.
  The sample was fabricated using equipment of MIPT Shared Facilities Center. This
  research was supported by Russian Science Foundation, grant no. 21-72-30026.
article_number: L031701
article_processing_charge: No
article_type: letter_note
arxiv: 1
author:
- first_name: Alesya
  full_name: Sokolova, Alesya
  id: 2d0a0600-edfb-11eb-afb5-c0f5fa7f4f3a
  last_name: Sokolova
  orcid: 0000-0002-8308-4144
- first_name: D. A.
  full_name: Kalacheva, D. A.
  last_name: Kalacheva
- first_name: G. P.
  full_name: Fedorov, G. P.
  last_name: Fedorov
- first_name: O. V.
  full_name: Astafiev, O. V.
  last_name: Astafiev
citation:
  ama: Sokolova A, Kalacheva DA, Fedorov GP, Astafiev OV. Overcoming photon blockade
    in a circuit-QED single-atom maser with engineered metastability and strong coupling.
    <i>Physical Review A</i>. 2023;107(3). doi:<a href="https://doi.org/10.1103/PhysRevA.107.L031701">10.1103/PhysRevA.107.L031701</a>
  apa: Sokolova, A., Kalacheva, D. A., Fedorov, G. P., &#38; Astafiev, O. V. (2023).
    Overcoming photon blockade in a circuit-QED single-atom maser with engineered
    metastability and strong coupling. <i>Physical Review A</i>. American Physical
    Society. <a href="https://doi.org/10.1103/PhysRevA.107.L031701">https://doi.org/10.1103/PhysRevA.107.L031701</a>
  chicago: Sokolova, Alesya, D. A. Kalacheva, G. P. Fedorov, and O. V. Astafiev. “Overcoming
    Photon Blockade in a Circuit-QED Single-Atom Maser with Engineered Metastability
    and Strong Coupling.” <i>Physical Review A</i>. American Physical Society, 2023.
    <a href="https://doi.org/10.1103/PhysRevA.107.L031701">https://doi.org/10.1103/PhysRevA.107.L031701</a>.
  ieee: A. Sokolova, D. A. Kalacheva, G. P. Fedorov, and O. V. Astafiev, “Overcoming
    photon blockade in a circuit-QED single-atom maser with engineered metastability
    and strong coupling,” <i>Physical Review A</i>, vol. 107, no. 3. American Physical
    Society, 2023.
  ista: Sokolova A, Kalacheva DA, Fedorov GP, Astafiev OV. 2023. Overcoming photon
    blockade in a circuit-QED single-atom maser with engineered metastability and
    strong coupling. Physical Review A. 107(3), L031701.
  mla: Sokolova, Alesya, et al. “Overcoming Photon Blockade in a Circuit-QED Single-Atom
    Maser with Engineered Metastability and Strong Coupling.” <i>Physical Review A</i>,
    vol. 107, no. 3, L031701, American Physical Society, 2023, doi:<a href="https://doi.org/10.1103/PhysRevA.107.L031701">10.1103/PhysRevA.107.L031701</a>.
  short: A. Sokolova, D.A. Kalacheva, G.P. Fedorov, O.V. Astafiev, Physical Review
    A 107 (2023).
date_created: 2023-04-09T22:01:00Z
date_published: 2023-03-22T00:00:00Z
date_updated: 2023-08-01T14:06:05Z
day: '22'
department:
- _id: JoFi
doi: 10.1103/PhysRevA.107.L031701
external_id:
  arxiv:
  - '2209.05165'
  isi:
  - '000957799000006'
intvolume: '       107'
isi: 1
issue: '3'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.48550/arXiv.2209.05165
month: '03'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Overcoming photon blockade in a circuit-QED single-atom maser with engineered
  metastability and strong coupling
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...
---
_id: '12914'
abstract:
- lang: eng
  text: We numerically study two methods of measuring tunneling times using a quantum
    clock. In the conventional method using the Larmor clock, we show that the Larmor
    tunneling time can be shorter for higher tunneling barriers. In the second method,
    we study the probability of a spin-flip of a particle when it is transmitted through
    a potential barrier including a spatially rotating field interacting with its
    spin. According to the adiabatic theorem, the probability depends on the velocity
    of the particle inside the barrier. It is numerically observed that the probability
    increases for higher barriers, which is consistent with the result obtained by
    the Larmor clock. By comparing outcomes for different initial spin states, we
    suggest that one of the main causes of the apparent decrease in the tunneling
    time can be the filtering effect occurring at the end of the barrier.
acknowledgement: We thank W. H. Zurek, N. Sinitsyn, M. O. Scully, M. Arndt, and C.
  H. Marrows for helpful discussions. F.S. acknowledges support from the Los Alamos
  National Laboratory LDRD program under Project No. 20230049DR and the Center for
  Nonlinear Studies. F.S. also thanks the European Union’s Horizon 2020 research and
  innovation program under the Marie Skłodowska-Curie Grant No. 754411 for support.
  W.G.U. thanks the Natural Science and Engineering Research Council of Canada, the
  Hagler Institute of Texas A&M University, the Helmholz Inst HZDR, Germany for support
  while this work was being done.
article_number: '042216'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Fumika
  full_name: Suzuki, Fumika
  id: 650C99FC-1079-11EA-A3C0-73AE3DDC885E
  last_name: Suzuki
  orcid: 0000-0003-4982-5970
- first_name: William G.
  full_name: Unruh, William G.
  last_name: Unruh
citation:
  ama: Suzuki F, Unruh WG. Numerical quantum clock simulations for measuring tunneling
    times. <i>Physical Review A</i>. 2023;107(4). doi:<a href="https://doi.org/10.1103/PhysRevA.107.042216">10.1103/PhysRevA.107.042216</a>
  apa: Suzuki, F., &#38; Unruh, W. G. (2023). Numerical quantum clock simulations
    for measuring tunneling times. <i>Physical Review A</i>. American Physical Society.
    <a href="https://doi.org/10.1103/PhysRevA.107.042216">https://doi.org/10.1103/PhysRevA.107.042216</a>
  chicago: Suzuki, Fumika, and William G. Unruh. “Numerical Quantum Clock Simulations
    for Measuring Tunneling Times.” <i>Physical Review A</i>. American Physical Society,
    2023. <a href="https://doi.org/10.1103/PhysRevA.107.042216">https://doi.org/10.1103/PhysRevA.107.042216</a>.
  ieee: F. Suzuki and W. G. Unruh, “Numerical quantum clock simulations for measuring
    tunneling times,” <i>Physical Review A</i>, vol. 107, no. 4. American Physical
    Society, 2023.
  ista: Suzuki F, Unruh WG. 2023. Numerical quantum clock simulations for measuring
    tunneling times. Physical Review A. 107(4), 042216.
  mla: Suzuki, Fumika, and William G. Unruh. “Numerical Quantum Clock Simulations
    for Measuring Tunneling Times.” <i>Physical Review A</i>, vol. 107, no. 4, 042216,
    American Physical Society, 2023, doi:<a href="https://doi.org/10.1103/PhysRevA.107.042216">10.1103/PhysRevA.107.042216</a>.
  short: F. Suzuki, W.G. Unruh, Physical Review A 107 (2023).
date_created: 2023-05-07T22:01:03Z
date_published: 2023-04-20T00:00:00Z
date_updated: 2023-08-01T14:33:21Z
day: '20'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.107.042216
ec_funded: 1
external_id:
  arxiv:
  - '2207.13130'
  isi:
  - '000975799300006'
intvolume: '       107'
isi: 1
issue: '4'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.48550/arXiv.2207.13130
month: '04'
oa: 1
oa_version: Preprint
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '754411'
  name: ISTplus - Postdoctoral Fellowships
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Numerical quantum clock simulations for measuring tunneling times
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 107
year: '2023'
...
---
_id: '11591'
abstract:
- lang: eng
  text: We investigate the deterministic generation and distribution of entanglement
    in large quantum networks by driving distant qubits with the output fields of
    a nondegenerate parametric amplifier. In this setting, the amplifier produces
    a continuous Gaussian two-mode squeezed state, which acts as a quantum-correlated
    reservoir for the qubits and relaxes them into a highly entangled steady state.
    Here we are interested in the maximal amount of entanglement and the optimal entanglement
    generation rates that can be achieved with this scheme under realistic conditions
    taking, in particular, the finite amplifier bandwidth, waveguide losses, and propagation
    delays into account. By combining exact numerical simulations of the full network
    with approximate analytic results, we predict the optimal working point for the
    amplifier and the corresponding qubit-qubit entanglement under various conditions.
    Our findings show that this passive conversion of Gaussian into discrete-variable
    entanglement offers a robust and experimentally very attractive approach for operating
    large optical, microwave, or hybrid quantum networks, for which efficient parametric
    amplifiers are currently developed.
acknowledgement: We thank T. Mavrogordatos and D. Zhu for initial contribution on
  the presented topic and K. Fedorov for stimulating discussions on entangled microwave
  beams. This work was supported by the Austrian Science Fund (FWF) through Grant
  No. P32299 (PHONED) and the European Union’s Horizon 2020 research and innovation
  programme under Grant Agreement No. 899354 (SuperQuLAN). Most of the computational
  results presented were obtained using the CLIP cluster [65].
article_number: '062454'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: J.
  full_name: Agustí, J.
  last_name: Agustí
- first_name: Y.
  full_name: Minoguchi, Y.
  last_name: Minoguchi
- first_name: Johannes M
  full_name: Fink, Johannes M
  id: 4B591CBA-F248-11E8-B48F-1D18A9856A87
  last_name: Fink
  orcid: 0000-0001-8112-028X
- first_name: P.
  full_name: Rabl, P.
  last_name: Rabl
citation:
  ama: Agustí J, Minoguchi Y, Fink JM, Rabl P. Long-distance distribution of qubit-qubit
    entanglement using Gaussian-correlated photonic beams. <i>Physical Review A</i>.
    2022;105(6). doi:<a href="https://doi.org/10.1103/PhysRevA.105.062454">10.1103/PhysRevA.105.062454</a>
  apa: Agustí, J., Minoguchi, Y., Fink, J. M., &#38; Rabl, P. (2022). Long-distance
    distribution of qubit-qubit entanglement using Gaussian-correlated photonic beams.
    <i>Physical Review A</i>. American Physical Society. <a href="https://doi.org/10.1103/PhysRevA.105.062454">https://doi.org/10.1103/PhysRevA.105.062454</a>
  chicago: Agustí, J., Y. Minoguchi, Johannes M Fink, and P. Rabl. “Long-Distance
    Distribution of Qubit-Qubit Entanglement Using Gaussian-Correlated Photonic Beams.”
    <i>Physical Review A</i>. American Physical Society, 2022. <a href="https://doi.org/10.1103/PhysRevA.105.062454">https://doi.org/10.1103/PhysRevA.105.062454</a>.
  ieee: J. Agustí, Y. Minoguchi, J. M. Fink, and P. Rabl, “Long-distance distribution
    of qubit-qubit entanglement using Gaussian-correlated photonic beams,” <i>Physical
    Review A</i>, vol. 105, no. 6. American Physical Society, 2022.
  ista: Agustí J, Minoguchi Y, Fink JM, Rabl P. 2022. Long-distance distribution of
    qubit-qubit entanglement using Gaussian-correlated photonic beams. Physical Review
    A. 105(6), 062454.
  mla: Agustí, J., et al. “Long-Distance Distribution of Qubit-Qubit Entanglement
    Using Gaussian-Correlated Photonic Beams.” <i>Physical Review A</i>, vol. 105,
    no. 6, 062454, American Physical Society, 2022, doi:<a href="https://doi.org/10.1103/PhysRevA.105.062454">10.1103/PhysRevA.105.062454</a>.
  short: J. Agustí, Y. Minoguchi, J.M. Fink, P. Rabl, Physical Review A 105 (2022).
date_created: 2022-07-17T22:01:55Z
date_published: 2022-06-29T00:00:00Z
date_updated: 2023-08-03T11:58:16Z
day: '29'
department:
- _id: JoFi
doi: 10.1103/PhysRevA.105.062454
ec_funded: 1
external_id:
  arxiv:
  - '2204.02993'
  isi:
  - '000824330200003'
intvolume: '       105'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: ' https://doi.org/10.48550/arXiv.2204.02993'
month: '06'
oa: 1
oa_version: Preprint
project:
- _id: 9B868D20-BA93-11EA-9121-9846C619BF3A
  call_identifier: H2020
  grant_number: '899354'
  name: Quantum Local Area Networks with Superconducting Qubits
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Long-distance distribution of qubit-qubit entanglement using Gaussian-correlated
  photonic beams
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 105
year: '2022'
...
---
_id: '11592'
abstract:
- lang: eng
  text: 'We compare recent experimental results [Science 375, 528 (2022)] of the superfluid
    unitary Fermi gas near the critical temperature with a thermodynamic model based
    on the elementary excitations of the system. We find good agreement between experimental
    data and our theory for several quantities such as first sound, second sound,
    and superfluid fraction. We also show that mode mixing between first and second
    sound occurs. Finally, we characterize the response amplitude to a density perturbation:
    Close to the critical temperature both first and second sound can be excited through
    a density perturbation, whereas at lower temperatures only the first sound mode
    exhibits a significant response.'
acknowledgement: The authors gratefully acknowledge stimulating discussions with T.
  Enss, and thank an anonymous referee for suggestions and remarks that allowed us
  to improve the original manuscript. This work is supported by the Deutsche Forschungsgemeinschaft
  (DFG, German Research Foundation) under Germany’s Excellence Strategy EXC2181/1-390900948
  (the Heidelberg STRUCTURES Excellence Cluster).
article_number: '063329'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Giacomo
  full_name: Bighin, Giacomo
  id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
  last_name: Bighin
  orcid: 0000-0001-8823-9777
- first_name: Alberto
  full_name: Cappellaro, Alberto
  id: 9d13b3cb-30a2-11eb-80dc-f772505e8660
  last_name: Cappellaro
  orcid: 0000-0001-6110-2359
- first_name: L.
  full_name: Salasnich, L.
  last_name: Salasnich
citation:
  ama: 'Bighin G, Cappellaro A, Salasnich L. Unitary Fermi superfluid near the critical
    temperature: Thermodynamics and sound modes from elementary excitations. <i>Physical
    Review A</i>. 2022;105(6). doi:<a href="https://doi.org/10.1103/PhysRevA.105.063329">10.1103/PhysRevA.105.063329</a>'
  apa: 'Bighin, G., Cappellaro, A., &#38; Salasnich, L. (2022). Unitary Fermi superfluid
    near the critical temperature: Thermodynamics and sound modes from elementary
    excitations. <i>Physical Review A</i>. American Physical Society. <a href="https://doi.org/10.1103/PhysRevA.105.063329">https://doi.org/10.1103/PhysRevA.105.063329</a>'
  chicago: 'Bighin, Giacomo, Alberto Cappellaro, and L. Salasnich. “Unitary Fermi
    Superfluid near the Critical Temperature: Thermodynamics and Sound Modes from
    Elementary Excitations.” <i>Physical Review A</i>. American Physical Society,
    2022. <a href="https://doi.org/10.1103/PhysRevA.105.063329">https://doi.org/10.1103/PhysRevA.105.063329</a>.'
  ieee: 'G. Bighin, A. Cappellaro, and L. Salasnich, “Unitary Fermi superfluid near
    the critical temperature: Thermodynamics and sound modes from elementary excitations,”
    <i>Physical Review A</i>, vol. 105, no. 6. American Physical Society, 2022.'
  ista: 'Bighin G, Cappellaro A, Salasnich L. 2022. Unitary Fermi superfluid near
    the critical temperature: Thermodynamics and sound modes from elementary excitations.
    Physical Review A. 105(6), 063329.'
  mla: 'Bighin, Giacomo, et al. “Unitary Fermi Superfluid near the Critical Temperature:
    Thermodynamics and Sound Modes from Elementary Excitations.” <i>Physical Review
    A</i>, vol. 105, no. 6, 063329, American Physical Society, 2022, doi:<a href="https://doi.org/10.1103/PhysRevA.105.063329">10.1103/PhysRevA.105.063329</a>.'
  short: G. Bighin, A. Cappellaro, L. Salasnich, Physical Review A 105 (2022).
date_created: 2022-07-17T22:01:55Z
date_published: 2022-06-30T00:00:00Z
date_updated: 2023-08-03T12:00:11Z
day: '30'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.105.063329
external_id:
  arxiv:
  - '2206.03924'
  isi:
  - '000829758500010'
intvolume: '       105'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: ' https://doi.org/10.48550/arXiv.2206.03924'
month: '06'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: 'Unitary Fermi superfluid near the critical temperature: Thermodynamics and
  sound modes from elementary excitations'
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 105
year: '2022'
...
---
_id: '11997'
abstract:
- lang: eng
  text: "We study the fate of an impurity in an ultracold heteronuclear Bose mixture,
    focusing on the experimentally relevant case of a ⁴¹K - ⁸⁷Rb mixture, with the
    impurity in a ⁴¹K hyperfine state. Our paper provides a comprehensive description
    of an impurity in a BEC mixture with contact interactions across its phase diagram.
    We present results for the miscible and immiscible regimes, as well as for the
    impurity in a self-bound quantum droplet. Here, varying the interactions, we find
    exotic states where the impurity localizes either at the center or\r\nat the surface
    of the droplet. "
acknowledgement: We thank A. Simoni for providing the calculations of the intercomponent
  scattering lengths. We gratefully acknowledge stimulating discussions with L. A.
  Peña Ardila, R. Schmidt, H. Silva, V. Zampronio, and M. Prevedelli for careful reading.
  G.B. acknowledges support from the Austrian Science Fund (FWF) under Project No.
  M2641-N27. T.M. acknowledges CNPq for support through Bolsa de produtividade em
  Pesquisa No. 311079/2015-6. This work is supported by the Deutsche Forschungsgemeinschaft
  (DFG, German Research Foundation) under Germany's Excellence Strategy No. EXC2181/1-390900948
  (the Heidelberg STRUCTURES Excellence Cluster). This work was supported by the Serrapilheira
  Institute (Grant No. Serra-1812-27802). We thank the High-Performance Computing
  Center (NPAD) at UFRN for providing computational resources.
article_number: '023301'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Giacomo
  full_name: Bighin, Giacomo
  id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
  last_name: Bighin
  orcid: 0000-0001-8823-9777
- first_name: A.
  full_name: Burchianti, A.
  last_name: Burchianti
- first_name: F.
  full_name: Minardi, F.
  last_name: Minardi
- first_name: T.
  full_name: Macrì, T.
  last_name: Macrì
citation:
  ama: Bighin G, Burchianti A, Minardi F, Macrì T. Impurity in a heteronuclear two-component
    Bose mixture. <i>Physical Review A</i>. 2022;106(2). doi:<a href="https://doi.org/10.1103/PhysRevA.106.023301">10.1103/PhysRevA.106.023301</a>
  apa: Bighin, G., Burchianti, A., Minardi, F., &#38; Macrì, T. (2022). Impurity in
    a heteronuclear two-component Bose mixture. <i>Physical Review A</i>. American
    Physical Society. <a href="https://doi.org/10.1103/PhysRevA.106.023301">https://doi.org/10.1103/PhysRevA.106.023301</a>
  chicago: Bighin, Giacomo, A. Burchianti, F. Minardi, and T. Macrì. “Impurity in
    a Heteronuclear Two-Component Bose Mixture.” <i>Physical Review A</i>. American
    Physical Society, 2022. <a href="https://doi.org/10.1103/PhysRevA.106.023301">https://doi.org/10.1103/PhysRevA.106.023301</a>.
  ieee: G. Bighin, A. Burchianti, F. Minardi, and T. Macrì, “Impurity in a heteronuclear
    two-component Bose mixture,” <i>Physical Review A</i>, vol. 106, no. 2. American
    Physical Society, 2022.
  ista: Bighin G, Burchianti A, Minardi F, Macrì T. 2022. Impurity in a heteronuclear
    two-component Bose mixture. Physical Review A. 106(2), 023301.
  mla: Bighin, Giacomo, et al. “Impurity in a Heteronuclear Two-Component Bose Mixture.”
    <i>Physical Review A</i>, vol. 106, no. 2, 023301, American Physical Society,
    2022, doi:<a href="https://doi.org/10.1103/PhysRevA.106.023301">10.1103/PhysRevA.106.023301</a>.
  short: G. Bighin, A. Burchianti, F. Minardi, T. Macrì, Physical Review A 106 (2022).
date_created: 2022-08-28T22:02:00Z
date_published: 2022-08-04T00:00:00Z
date_updated: 2024-08-07T07:16:52Z
day: '04'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.106.023301
external_id:
  arxiv:
  - '2109.07451'
  isi:
  - '000837953600006'
intvolume: '       106'
isi: 1
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://doi.org/10.48550/arXiv.2109.07451
month: '08'
oa: 1
oa_version: Preprint
project:
- _id: 26986C82-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: M02641
  name: A path-integral approach to composite impurities
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Impurity in a heteronuclear two-component Bose mixture
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 106
year: '2022'
...
---
_id: '13997'
abstract:
- lang: eng
  text: We investigate theoretically the strong-field regime of light-matter interactions
    in the topological-insulator class of quantum materials. In particular, we focus
    on the process of nonperturbative high-order harmonic generation from the paradigmatic
    three-dimensional topological insulator bismuth selenide (Bi2Se3) subjected to
    intense midinfrared laser fields. We analyze the contributions from the spin-orbit-coupled
    bulk states and the topological surface bands separately and reveal a major difference
    in how their harmonic yields depend on the ellipticity of the laser field. Bulk
    harmonics show a monotonic decrease in their yield as the ellipticity increases,
    in a manner reminiscent of high harmonic generation in gaseous media. However,
    the surface contribution exhibits a highly nontrivial dependence, culminating
    with a maximum for circularly polarized fields. We attribute the observed anomalous
    behavior to (i) the enhanced amplitude and the circular pattern of the interband
    dipole and the Berry connections in the vicinity of the Dirac point and (ii) the
    influence of the higher-order, hexagonal warping terms in the Hamiltonian, which
    are responsible for the hexagonal deformation of the energy surface at higher
    momenta. The latter are associated directly with spin-orbit-coupling parameters.
    Our results thus establish the sensitivity of strong-field-driven high harmonic
    emission to the topology of the band structure as well as to the manifestations
    of spin-orbit interaction.
article_number: '023101'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Denitsa Rangelova
  full_name: Baykusheva, Denitsa Rangelova
  id: 71b4d059-2a03-11ee-914d-dfa3beed6530
  last_name: Baykusheva
- first_name: Alexis
  full_name: Chacón, Alexis
  last_name: Chacón
- first_name: Dasol
  full_name: Kim, Dasol
  last_name: Kim
- first_name: Dong Eon
  full_name: Kim, Dong Eon
  last_name: Kim
- first_name: David A.
  full_name: Reis, David A.
  last_name: Reis
- first_name: Shambhu
  full_name: Ghimire, Shambhu
  last_name: Ghimire
citation:
  ama: Baykusheva DR, Chacón A, Kim D, Kim DE, Reis DA, Ghimire S. Strong-field physics
    in three-dimensional topological insulators. <i>Physical Review A</i>. 2021;103(2).
    doi:<a href="https://doi.org/10.1103/physreva.103.023101">10.1103/physreva.103.023101</a>
  apa: Baykusheva, D. R., Chacón, A., Kim, D., Kim, D. E., Reis, D. A., &#38; Ghimire,
    S. (2021). Strong-field physics in three-dimensional topological insulators. <i>Physical
    Review A</i>. American Physical Society. <a href="https://doi.org/10.1103/physreva.103.023101">https://doi.org/10.1103/physreva.103.023101</a>
  chicago: Baykusheva, Denitsa Rangelova, Alexis Chacón, Dasol Kim, Dong Eon Kim,
    David A. Reis, and Shambhu Ghimire. “Strong-Field Physics in Three-Dimensional
    Topological Insulators.” <i>Physical Review A</i>. American Physical Society,
    2021. <a href="https://doi.org/10.1103/physreva.103.023101">https://doi.org/10.1103/physreva.103.023101</a>.
  ieee: D. R. Baykusheva, A. Chacón, D. Kim, D. E. Kim, D. A. Reis, and S. Ghimire,
    “Strong-field physics in three-dimensional topological insulators,” <i>Physical
    Review A</i>, vol. 103, no. 2. American Physical Society, 2021.
  ista: Baykusheva DR, Chacón A, Kim D, Kim DE, Reis DA, Ghimire S. 2021. Strong-field
    physics in three-dimensional topological insulators. Physical Review A. 103(2),
    023101.
  mla: Baykusheva, Denitsa Rangelova, et al. “Strong-Field Physics in Three-Dimensional
    Topological Insulators.” <i>Physical Review A</i>, vol. 103, no. 2, 023101, American
    Physical Society, 2021, doi:<a href="https://doi.org/10.1103/physreva.103.023101">10.1103/physreva.103.023101</a>.
  short: D.R. Baykusheva, A. Chacón, D. Kim, D.E. Kim, D.A. Reis, S. Ghimire, Physical
    Review A 103 (2021).
date_created: 2023-08-09T13:09:26Z
date_published: 2021-02-01T00:00:00Z
date_updated: 2023-08-22T07:33:43Z
day: '01'
doi: 10.1103/physreva.103.023101
extern: '1'
external_id:
  arxiv:
  - '2008.01265'
intvolume: '       103'
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/2008.01265
month: '02'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Strong-field physics in three-dimensional topological insulators
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 103
year: '2021'
...
---
_id: '9242'
abstract:
- lang: eng
  text: In the recent years important experimental advances in resonant electro-optic
    modulators as high-efficiency sources for coherent frequency combs and as devices
    for quantum information transfer have been realized, where strong optical and
    microwave mode coupling were achieved. These features suggest electro-optic-based
    devices as candidates for entangled optical frequency comb sources. In the present
    work, I study the generation of entangled optical frequency combs in millimeter-sized
    resonant electro-optic modulators. These devices profit from the experimentally
    proven advantages such as nearly constant optical free spectral ranges over several
    gigahertz, and high optical and microwave quality factors. The generation of frequency
    multiplexed quantum channels with spectral bandwidth in the MHz range for conservative
    parameter values paves the way towards novel uses in long-distance hybrid quantum
    networks, quantum key distribution, enhanced optical metrology, and quantum computing.
acknowledgement: "I thank Prof. Shabir Barzanjeh and Dr. Ulrich Vogl for the fruitful
  discussions.\r\n"
article_number: '023708'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Alfredo R
  full_name: Rueda Sanchez, Alfredo R
  id: 3B82B0F8-F248-11E8-B48F-1D18A9856A87
  last_name: Rueda Sanchez
  orcid: 0000-0001-6249-5860
citation:
  ama: Rueda Sanchez AR. Frequency-multiplexed hybrid optical entangled source based
    on the Pockels effect. <i>Physical Review A</i>. 2021;103(2). doi:<a href="https://doi.org/10.1103/PhysRevA.103.023708">10.1103/PhysRevA.103.023708</a>
  apa: Rueda Sanchez, A. R. (2021). Frequency-multiplexed hybrid optical entangled
    source based on the Pockels effect. <i>Physical Review A</i>. American Physical
    Society. <a href="https://doi.org/10.1103/PhysRevA.103.023708">https://doi.org/10.1103/PhysRevA.103.023708</a>
  chicago: Rueda Sanchez, Alfredo R. “Frequency-Multiplexed Hybrid Optical Entangled
    Source Based on the Pockels Effect.” <i>Physical Review A</i>. American Physical
    Society, 2021. <a href="https://doi.org/10.1103/PhysRevA.103.023708">https://doi.org/10.1103/PhysRevA.103.023708</a>.
  ieee: A. R. Rueda Sanchez, “Frequency-multiplexed hybrid optical entangled source
    based on the Pockels effect,” <i>Physical Review A</i>, vol. 103, no. 2. American
    Physical Society, 2021.
  ista: Rueda Sanchez AR. 2021. Frequency-multiplexed hybrid optical entangled source
    based on the Pockels effect. Physical Review A. 103(2), 023708.
  mla: Rueda Sanchez, Alfredo R. “Frequency-Multiplexed Hybrid Optical Entangled Source
    Based on the Pockels Effect.” <i>Physical Review A</i>, vol. 103, no. 2, 023708,
    American Physical Society, 2021, doi:<a href="https://doi.org/10.1103/PhysRevA.103.023708">10.1103/PhysRevA.103.023708</a>.
  short: A.R. Rueda Sanchez, Physical Review A 103 (2021).
date_created: 2021-03-14T23:01:33Z
date_published: 2021-02-11T00:00:00Z
date_updated: 2023-08-07T14:11:18Z
day: '11'
department:
- _id: JoFi
doi: 10.1103/PhysRevA.103.023708
external_id:
  arxiv:
  - '2010.05356'
  isi:
  - '000617037900013'
intvolume: '       103'
isi: 1
issue: '2'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/2010.05356
month: '02'
oa: 1
oa_version: Preprint
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Frequency-multiplexed hybrid optical entangled source based on the Pockels
  effect
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 103
year: '2021'
...
---
_id: '10545'
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.
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.
article_number: '062423'
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Raimel A
  full_name: Medina Ramos, Raimel A
  id: CE680B90-D85A-11E9-B684-C920E6697425
  last_name: Medina Ramos
  orcid: 0000-0002-5383-2869
- first_name: Maksym
  full_name: Serbyn, Maksym
  id: 47809E7E-F248-11E8-B48F-1D18A9856A87
  last_name: Serbyn
  orcid: 0000-0002-2399-5827
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>
  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>
  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>.
  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.
  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.
  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>.
  short: R.A. Medina Ramos, M. Serbyn, Physical Review A 104 (2021).
date_created: 2021-12-14T20:46:07Z
date_published: 2021-12-14T00:00:00Z
date_updated: 2023-08-17T06:22:49Z
day: '14'
department:
- _id: MaSe
doi: 10.1103/physreva.104.062423
ec_funded: 1
external_id:
  arxiv:
  - '2106.06344'
  isi:
  - '000753659200004'
intvolume: '       104'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/2106.06344
month: '12'
oa: 1
oa_version: Preprint
project:
- _id: 23841C26-32DE-11EA-91FC-C7463DDC885E
  call_identifier: H2020
  grant_number: '850899'
  name: 'Non-Ergodic Quantum Matter: Universality, Dynamics and Control'
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
status: public
title: Duality approach to quantum annealing of the 3-variable exclusive-or satisfiability
  problem (3-XORSAT)
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 104
year: '2021'
...
---
_id: '10631'
abstract:
- lang: eng
  text: We combine experimental and theoretical approaches to explore excited rotational
    states of molecules embedded in helium nanodroplets using CS2 and I2 as examples.
    Laser-induced nonadiabatic molecular alignment is employed to measure spectral
    lines for rotational states extending beyond those initially populated at the
    0.37 K droplet temperature. We construct a simple quantum-mechanical model, based
    on a linear rotor coupled to a single-mode bosonic bath, to determine the rotational
    energy structure in its entirety. The calculated and measured spectral lines are
    in good agreement. We show that the effect of the surrounding superfluid on molecular
    rotation can be rationalized by a single quantity, the angular momentum, transferred
    from the molecule to the droplet.
acknowledgement: I.C. acknowledges the support by the European Union’s Horizon 2020
  research and innovation programme under the Marie Sklodowska-Curie Grant Agreement
  No. 665385. G.B. acknowledges support from the Austrian Science Fund (FWF), under
  project No. M2461-N27. M.L. acknowledges support by the Austrian Science Fund (FWF),
  under project No. P29902-N27, and by the European Research Council (ERC) Starting
  Grant No. 801770 (ANGULON). H.S acknowledges support from the European Research
  Council-AdG (Project No. 320459, DropletControl) and from The Villum Foundation
  through a Villum Investigator grant no. 25886.
article_number: L061303
article_processing_charge: No
article_type: original
arxiv: 1
author:
- first_name: Igor
  full_name: Cherepanov, Igor
  id: 339C7E5A-F248-11E8-B48F-1D18A9856A87
  last_name: Cherepanov
- first_name: Giacomo
  full_name: Bighin, Giacomo
  id: 4CA96FD4-F248-11E8-B48F-1D18A9856A87
  last_name: Bighin
  orcid: 0000-0001-8823-9777
- first_name: Constant A.
  full_name: Schouder, Constant A.
  last_name: Schouder
- first_name: Adam S.
  full_name: Chatterley, Adam S.
  last_name: Chatterley
- first_name: Simon H.
  full_name: Albrechtsen, Simon H.
  last_name: Albrechtsen
- first_name: Alberto Viñas
  full_name: Muñoz, Alberto Viñas
  last_name: Muñoz
- first_name: Lars
  full_name: Christiansen, Lars
  last_name: Christiansen
- first_name: Henrik
  full_name: Stapelfeldt, Henrik
  last_name: Stapelfeldt
- first_name: Mikhail
  full_name: Lemeshko, Mikhail
  id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
  last_name: Lemeshko
  orcid: 0000-0002-6990-7802
citation:
  ama: Cherepanov I, Bighin G, Schouder CA, et al. Excited rotational states of molecules
    in a superfluid. <i>Physical Review A</i>. 2021;104(6). doi:<a href="https://doi.org/10.1103/PhysRevA.104.L061303">10.1103/PhysRevA.104.L061303</a>
  apa: Cherepanov, I., Bighin, G., Schouder, C. A., Chatterley, A. S., Albrechtsen,
    S. H., Muñoz, A. V., … Lemeshko, M. (2021). Excited rotational states of molecules
    in a superfluid. <i>Physical Review A</i>. American Physical Society. <a href="https://doi.org/10.1103/PhysRevA.104.L061303">https://doi.org/10.1103/PhysRevA.104.L061303</a>
  chicago: Cherepanov, Igor, Giacomo Bighin, Constant A. Schouder, Adam S. Chatterley,
    Simon H. Albrechtsen, Alberto Viñas Muñoz, Lars Christiansen, Henrik Stapelfeldt,
    and Mikhail Lemeshko. “Excited Rotational States of Molecules in a Superfluid.”
    <i>Physical Review A</i>. American Physical Society, 2021. <a href="https://doi.org/10.1103/PhysRevA.104.L061303">https://doi.org/10.1103/PhysRevA.104.L061303</a>.
  ieee: I. Cherepanov <i>et al.</i>, “Excited rotational states of molecules in a
    superfluid,” <i>Physical Review A</i>, vol. 104, no. 6. American Physical Society,
    2021.
  ista: Cherepanov I, Bighin G, Schouder CA, Chatterley AS, Albrechtsen SH, Muñoz
    AV, Christiansen L, Stapelfeldt H, Lemeshko M. 2021. Excited rotational states
    of molecules in a superfluid. Physical Review A. 104(6), L061303.
  mla: Cherepanov, Igor, et al. “Excited Rotational States of Molecules in a Superfluid.”
    <i>Physical Review A</i>, vol. 104, no. 6, L061303, American Physical Society,
    2021, doi:<a href="https://doi.org/10.1103/PhysRevA.104.L061303">10.1103/PhysRevA.104.L061303</a>.
  short: I. Cherepanov, G. Bighin, C.A. Schouder, A.S. Chatterley, S.H. Albrechtsen,
    A.V. Muñoz, L. Christiansen, H. Stapelfeldt, M. Lemeshko, Physical Review A 104
    (2021).
date_created: 2022-01-16T23:01:29Z
date_published: 2021-12-30T00:00:00Z
date_updated: 2024-08-07T07:16:52Z
day: '30'
department:
- _id: MiLe
doi: 10.1103/PhysRevA.104.L061303
ec_funded: 1
external_id:
  arxiv:
  - '2107.00468'
  isi:
  - '000739618300001'
intvolume: '       104'
isi: 1
issue: '6'
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: http://128.84.4.18/abs/2107.00468
month: '12'
oa: 1
oa_version: Preprint
project:
- _id: 26031614-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: P29902
  name: Quantum rotations in the presence of a many-body environment
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '801770'
  name: 'Angulon: physics and applications of a new quasiparticle'
- _id: 2564DBCA-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '665385'
  name: International IST Doctoral Program
- _id: 26986C82-B435-11E9-9278-68D0E5697425
  call_identifier: FWF
  grant_number: M02641
  name: A path-integral approach to composite impurities
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Excited rotational states of molecules in a superfluid
type: journal_article
user_id: 4359f0d1-fa6c-11eb-b949-802e58b17ae8
volume: 104
year: '2021'
...
---
_id: '14009'
abstract:
- lang: eng
  text: Attosecond delays between photoelectron wave packets emitted from different
    electronic shells are now well established. Is there any delay between electrons
    originating from the same electronic shell but leaving the cation in different
    fine-structure states? This question is relevant for all attosecond photoemission
    studies involving heavy elements, be it atoms, molecules or solids. We answer
    this fundamental question by measuring energy-dependent delays between photoelectron
    wave packets associated with the 2P3/2 and 2P1/2 components of the electronic
    groundstates of Xe+ and Kr+. We observe delays reaching up to 33±6 as in the case
    of Xe. Our results are compared with two state-of-the-art theories. Whereas both
    theories quantitatively agree with the results obtained for Kr, neither of them
    fully reproduces the experimental results in Xe. Performing delay measurements
    very close to the ionization thresholds, we compare the agreement of several analytical
    formulas for the continuum-continuum delays with experimental data. Our results
    show an important influence of spin-orbit coupling on attosecond photoionization
    delays, highlight the requirement for additional theory development, and offer
    a precision benchmark for such work.
article_number: '013404'
article_processing_charge: No
article_type: original
author:
- first_name: I.
  full_name: Jordan, I.
  last_name: Jordan
- first_name: M.
  full_name: Huppert, M.
  last_name: Huppert
- first_name: S.
  full_name: Pabst, S.
  last_name: Pabst
- first_name: A. S.
  full_name: Kheifets, A. S.
  last_name: Kheifets
- first_name: Denitsa Rangelova
  full_name: Baykusheva, Denitsa Rangelova
  id: 71b4d059-2a03-11ee-914d-dfa3beed6530
  last_name: Baykusheva
- first_name: H. J.
  full_name: Wörner, H. J.
  last_name: Wörner
citation:
  ama: Jordan I, Huppert M, Pabst S, Kheifets AS, Baykusheva DR, Wörner HJ. Spin-orbit
    delays in photoemission. <i>Physical Review A</i>. 2017;95(1). doi:<a href="https://doi.org/10.1103/physreva.95.013404">10.1103/physreva.95.013404</a>
  apa: Jordan, I., Huppert, M., Pabst, S., Kheifets, A. S., Baykusheva, D. R., &#38;
    Wörner, H. J. (2017). Spin-orbit delays in photoemission. <i>Physical Review A</i>.
    American Physical Society. <a href="https://doi.org/10.1103/physreva.95.013404">https://doi.org/10.1103/physreva.95.013404</a>
  chicago: Jordan, I., M. Huppert, S. Pabst, A. S. Kheifets, Denitsa Rangelova Baykusheva,
    and H. J. Wörner. “Spin-Orbit Delays in Photoemission.” <i>Physical Review A</i>.
    American Physical Society, 2017. <a href="https://doi.org/10.1103/physreva.95.013404">https://doi.org/10.1103/physreva.95.013404</a>.
  ieee: I. Jordan, M. Huppert, S. Pabst, A. S. Kheifets, D. R. Baykusheva, and H.
    J. Wörner, “Spin-orbit delays in photoemission,” <i>Physical Review A</i>, vol.
    95, no. 1. American Physical Society, 2017.
  ista: Jordan I, Huppert M, Pabst S, Kheifets AS, Baykusheva DR, Wörner HJ. 2017.
    Spin-orbit delays in photoemission. Physical Review A. 95(1), 013404.
  mla: Jordan, I., et al. “Spin-Orbit Delays in Photoemission.” <i>Physical Review
    A</i>, vol. 95, no. 1, 013404, American Physical Society, 2017, doi:<a href="https://doi.org/10.1103/physreva.95.013404">10.1103/physreva.95.013404</a>.
  short: I. Jordan, M. Huppert, S. Pabst, A.S. Kheifets, D.R. Baykusheva, H.J. Wörner,
    Physical Review A 95 (2017).
date_created: 2023-08-10T06:36:58Z
date_published: 2017-01-10T00:00:00Z
date_updated: 2023-08-22T08:38:17Z
day: '10'
doi: 10.1103/physreva.95.013404
extern: '1'
intvolume: '        95'
issue: '1'
language:
- iso: eng
month: '01'
oa_version: None
publication: Physical Review A
publication_identifier:
  eissn:
  - 2469-9934
  issn:
  - 2469-9926
publication_status: published
publisher: American Physical Society
quality_controlled: '1'
scopus_import: '1'
status: public
title: Spin-orbit delays in photoemission
type: journal_article
user_id: 2DF688A6-F248-11E8-B48F-1D18A9856A87
volume: 95
year: '2017'
...