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Edge states using ultracold atoms

Research Project

Project/Area Number 19K14639
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
Research InstitutionInstitute for Molecular Science

Principal Investigator

Sugawa Seiji  分子科学研究所, 光分子科学研究領域, 助教 (70768556)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2020: ¥130,000 (Direct Cost: ¥100,000、Indirect Cost: ¥30,000)
Fiscal Year 2019: ¥4,030,000 (Direct Cost: ¥3,100,000、Indirect Cost: ¥930,000)
Keywords冷却原子 / 人工ゲージ場 / ボース・アインシュタイン凝縮体 / 量子制御 / 幾何学的位相 / 非可換ベリー位相 / リュードベリ状態 / 光格子 / トポロジカル物性
Outline of Research at the Start

「バルク・エッジ対応」で良く知られているようにトポロジカル物性においては、界面やエッジが重要な役割を果たしている。一方で冷却原子系では緩やなポテンシャルに原子集団が閉じ込めることが一般的であったため、明確な界面は存在できていなかった。本研究ではレーザー光の空間モードをエンジニアリングすることにより、冷却原子に対して界面や接合面を創り出して、実空間中のトポロジカルなエッジ状態を観測することを目指す。

Outline of Final Research Achievements

In physics and chemistry, geometrical and topological properties of quantum systems can characterize their physical properties and even determines their macroscopic behaviors. Here, using Bose-Einstein condensate of rubidium atoms dressed with precisely-tuned microwave-fields, we successfully quantum-engineered a non-Abelian SU(2) gauge field. By adiabatically controlling the Hamiltonian such that the state follows an adiabatic closed trajectory, we observed a Wilczek-Zee phase, a non-Abelian extension of Berry's geometric phase. We successfully evaluated the Wilczek-Zee phase using quantum process tomography and characterized them in a gauge-independent way in terms of the Wilson loop.

Academic Significance and Societal Importance of the Research Achievements

量子系の幾何学的・トポロジカルな特性は、物理や化学など分野横断的に議論されており、物性を特徴づけ、マクロな振る舞いさえも決定するなど重要性が高い。冷却原子系は量子シミュレータ、量子コンピュータ、量子センサーのプラットフォームとして注目されており、本研究成果は、非可換な幾何学的位相を用いたスピン・デバイスや量子シミュレーション、量子センサー、ホロノミック量子コンピューティングへの応用が期待される。

Report

(4 results)
  • 2021 Annual Research Report   Final Research Report ( PDF )
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (11 results)

All 2022 2021 2020

All Journal Article (8 results) (of which Int'l Joint Research: 4 results,  Open Access: 5 results,  Peer Reviewed: 4 results) Presentation (3 results) (of which Invited: 1 results)

  • [Journal Article] Ultrafast many-body dynamics in an ultracold Rydberg-excited atomic Mott insulator2022

    • Author(s)
      V. Bharti, S. Sugawa, M. Mizoguchi, M. Kunimi, Y. Zhang, S. de Leseleuc, T. Tomita, T. Franz, M. Weidemueller, K. Ohmori
    • Journal Title

      arXiv.2201.09590

      Volume: -

    • Related Report
      2021 Annual Research Report
    • Open Access / Int'l Joint Research
  • [Journal Article] Ultrafast energy exchange between two single Rydberg atoms on the nanosecond timescale2021

    • Author(s)
      Yeelai Chew, Takafumi Tomita, Tirumalasetty Panduranga Mahesh, Seiji Sugawa, Sylvain de Leseleuc, Kenji Ohmori
    • Journal Title

      arXiv.2111.12314

      Volume: -

    • Related Report
      2021 Annual Research Report
    • Open Access
  • [Journal Article] Wilson loop and Wilczek-Zee phase from a non-Abelian gauge field2021

    • Author(s)
      Sugawa Seiji、Salces-Carcoba Francisco、Yue Yuchen、Putra Andika、Spielman I. B.
    • Journal Title

      npj Quantum Information

      Volume: 7 Issue: 1

    • DOI

      10.1038/s41534-021-00483-2

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Multiple-camera defocus imaging of ultracold atomic gases2021

    • Author(s)
      Perry A. R.、Sugawa S.、Salces-Carcoba F.、Yue Y.、Spielman I. B.
    • Journal Title

      Optics Express

      Volume: 29 Issue: 11 Pages: 17029-17029

    • DOI

      10.1364/oe.422981

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] アト秒精度の極低温・超高速量子シミュレータ2021

    • Author(s)
      素川靖司、富田隆文、Sylvain de Leseleuc、安藤太郎、武井宣幸、大森賢治
    • Journal Title

      固体物理(アグネ技術センター)

      Volume: 56 Pages: 243-256

    • NAID

      40022596589

    • Related Report
      2021 Annual Research Report
    • Open Access
  • [Journal Article] Tools for quantum simulation with ultracold atoms in optical lattices2020

    • Author(s)
      Schaefer Florian, Fukuhara Takeshi, Sugawa Seiji, Takasu Yosuke, Takahashi Yoshiro
    • Journal Title

      Nature Reviews Physics

      Volume: 2 Issue: 8 Pages: 411-425

    • DOI

      10.1038/s42254-020-0195-3

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] 冷却原子で探るトポロジカル不変量とモノポール2020

    • Author(s)
      素川 靖司
    • Journal Title

      数理科学 2020年6月号(サイエンス社)

      Volume: 58 Pages: 53-59

    • Related Report
      2020 Research-status Report
  • [Journal Article] Spatial Coherence of Spin-Orbit-Coupled Bose Gases2020

    • Author(s)
      Putra Andika、Salces-Carcoba F.、Yue Yuchen、Sugawa Seiji、Spielman I.B.
    • Journal Title

      Physical Review Letters

      Volume: 124 Issue: 5 Pages: 0536051-6

    • DOI

      10.1103/physrevlett.124.053605

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] 光格子を用いたアト秒精度の極低温・超高速多体量子シミュレータの開発2021

    • Author(s)
      素川 靖司
    • Organizer
      第1回Q-LEAP次世代レーザー領域シンポジウム
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] Geometric Wilczek-Zee phase from a non-abelian gauge field and its application2020

    • Author(s)
      Seiji Sugawa
    • Organizer
      第2回冷却原子研究会「アトムの会」
    • Related Report
      2020 Research-status Report
  • [Presentation] 幾何学的Wilczek-Zee位相の観測2020

    • Author(s)
      素川靖司、F. Salces-Carcoba、Y. Yue、A. Putra、I. B. Spielman
    • Organizer
      日本物理学会 第75回年次大会
    • Related Report
      2019 Research-status Report

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Published: 2019-04-18   Modified: 2023-01-30  

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