---
_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: '10134'
abstract:
- lang: eng
  text: We investigate the effect of coupling between translational and internal degrees
    of freedom of composite quantum particles on their localization in a random potential.
    We show that entanglement between the two degrees of freedom weakens localization
    due to the upper bound imposed on the inverse participation ratio by purity of
    a quantum state. We perform numerical calculations for a two-particle system bound
    by a harmonic force in a 1D disordered lattice and a rigid rotor in a 2D disordered
    lattice. We illustrate that the coupling has a dramatic effect on localization
    properties, even with a small number of internal states participating in quantum
    dynamics.
acknowledgement: "We acknowledge helpful discussions with W. G. Unruh and A. Rodriguez.
  F. S. is supported by European Union’s\r\nHorizon 2020 research and innovation programme
  under the Marie Skłodowska-Curie Grant No. 754411. M. L. acknowledges support by
  the European Research Council (ERC) Starting Grant No. 801770 (ANGULON). W. H. Z.
  is\r\nsupported by Department of Energy under the Los\r\nAlamos National Laboratory
  LDRD Program as well as by the U.S. Department of Energy, Office of Science, Basic\r\nEnergy
  Sciences, Materials Sciences and Engineering Division, Condensed Matter Theory Program.
  R. V. K. is supported by NSERC of Canada.\r\n"
article_number: '160602'
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: Mikhail
  full_name: Lemeshko, Mikhail
  id: 37CB05FA-F248-11E8-B48F-1D18A9856A87
  last_name: Lemeshko
  orcid: 0000-0002-6990-7802
- first_name: Wojciech H.
  full_name: Zurek, Wojciech H.
  last_name: Zurek
- first_name: Roman V.
  full_name: Krems, Roman V.
  last_name: Krems
citation:
  ama: Suzuki F, Lemeshko M, Zurek WH, Krems RV. Anderson localization of composite
    particles. <i>Physical Review Letters</i>. 2021;127(16). doi:<a href="https://doi.org/10.1103/physrevlett.127.160602">10.1103/physrevlett.127.160602</a>
  apa: Suzuki, F., Lemeshko, M., Zurek, W. H., &#38; Krems, R. V. (2021). Anderson
    localization of composite particles. <i>Physical Review Letters</i>. American
    Physical Society . <a href="https://doi.org/10.1103/physrevlett.127.160602">https://doi.org/10.1103/physrevlett.127.160602</a>
  chicago: Suzuki, Fumika, Mikhail Lemeshko, Wojciech H. Zurek, and Roman V. Krems.
    “Anderson Localization of Composite Particles.” <i>Physical Review Letters</i>.
    American Physical Society , 2021. <a href="https://doi.org/10.1103/physrevlett.127.160602">https://doi.org/10.1103/physrevlett.127.160602</a>.
  ieee: F. Suzuki, M. Lemeshko, W. H. Zurek, and R. V. Krems, “Anderson localization
    of composite particles,” <i>Physical Review Letters</i>, vol. 127, no. 16. American
    Physical Society , 2021.
  ista: Suzuki F, Lemeshko M, Zurek WH, Krems RV. 2021. Anderson localization of composite
    particles. Physical Review Letters. 127(16), 160602.
  mla: Suzuki, Fumika, et al. “Anderson Localization of Composite Particles.” <i>Physical
    Review Letters</i>, vol. 127, no. 16, 160602, American Physical Society , 2021,
    doi:<a href="https://doi.org/10.1103/physrevlett.127.160602">10.1103/physrevlett.127.160602</a>.
  short: F. Suzuki, M. Lemeshko, W.H. Zurek, R.V. Krems, Physical Review Letters 127
    (2021).
date_created: 2021-10-13T09:21:33Z
date_published: 2021-10-12T00:00:00Z
date_updated: 2024-02-29T12:34:10Z
day: '12'
department:
- _id: MiLe
doi: 10.1103/physrevlett.127.160602
ec_funded: 1
external_id:
  arxiv:
  - '2011.06279'
  isi:
  - '000707495700001'
intvolume: '       127'
isi: 1
issue: '16'
keyword:
- General Physics and Astronomy
language:
- iso: eng
main_file_link:
- open_access: '1'
  url: https://arxiv.org/abs/2011.06279
month: '10'
oa: 1
oa_version: Preprint
project:
- _id: 260C2330-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '754411'
  name: ISTplus - Postdoctoral Fellowships
- _id: 2688CF98-B435-11E9-9278-68D0E5697425
  call_identifier: H2020
  grant_number: '801770'
  name: 'Angulon: physics and applications of a new quasiparticle'
publication: Physical Review Letters
publication_identifier:
  eissn:
  - 1079-7114
  issn:
  - 0031-9007
publication_status: published
publisher: 'American Physical Society '
quality_controlled: '1'
scopus_import: '1'
status: public
title: Anderson localization of composite particles
type: journal_article
user_id: 3E5EF7F0-F248-11E8-B48F-1D18A9856A87
volume: 127
year: '2021'
...