• Search Research Projects
  • Search Researchers
  • How to Use
  1. Back to previous page

Realization of PT-symmetric quantum optical systems towards innovative quantum state control

Research Project

Project/Area Number 18K18733
Research Category

Grant-in-Aid for Challenging Research (Exploratory)

Allocation TypeMulti-year Fund
Review Section Medium-sized Section 13:Condensed matter physics and related fields
Research InstitutionKyoto University

Principal Investigator

Okamoto Ryo  京都大学, 工学研究科, 准教授 (10435951)

Co-Investigator(Kenkyū-buntansha) 小布施 秀明  北海道大学, 工学研究院, 助教 (50415121)
Project Period (FY) 2018-06-29 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Fiscal Year 2019: ¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2018: ¥2,730,000 (Direct Cost: ¥2,100,000、Indirect Cost: ¥630,000)
Keywords開放量子系 / 量子光学 / 量子情報科学 / 量子ウォーク / PT対称 / PT対称性
Outline of Final Research Achievements

First, we developed a method to control the effect of loss and gain of photons in open quantum systems. Then, by using the developed method, we introduced new degrees of freedom into open quantum systems and aimed to observe novel physical phenomena. Consequently, we theoretically proposed and experimentally demonstrated that a peculiar phenomenon occurs at the reflection boundary of a quantum walk system when the system has an asymmetry regarding the effect of loss.

Academic Significance and Societal Importance of the Research Achievements

開放量子系の物理学は,量子力学の理論を構築する上で重要な演算子のエルミート性を要請せずに、開放系を含むより広範囲な量子系の物理を包括的に説明する試みである。開放量子系においては、PT対称性の破れにともないダイナミクスの急激な変化が生じることが知られている。また、粒子の流出入量を新たな制御パラメーターとすることが可能となる。本研究は、光子の流出入量の制御する新たなアプローチを確立し、新奇な物理現象の観測に成功したものである。本研究成果は、基礎物理学として重要なことはもちろん、新しい量子状態の制御法や量子デバイス開発への応用が期待される。

Report

(4 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • Research Products

    (27 results)

All 2021 2020 2019 2018

All Journal Article (6 results) (of which Int'l Joint Research: 1 results,  Peer Reviewed: 5 results,  Open Access: 1 results) Presentation (21 results) (of which Int'l Joint Research: 10 results,  Invited: 11 results)

  • [Journal Article] Bulk-edge correspondence and stability of multiple edge states of a PT symmetric non-Hermitian system by using non-unitary quantum walks2020

    • Author(s)
      Makio Kawasaki, Ken Mochizuki, Norio Kawakami, Hideaki Obuse
    • Journal Title

      Progress of Theoretical and Experimental Physics

      Volume: - Issue: 12

    • DOI

      10.1093/ptep/ptaa034

    • Related Report
      2020 Annual Research Report 2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Bulk-edge correspondence in nonunitary Floquet systems with chiral symmetry2020

    • Author(s)
      Ken Mochizuki, Dakyeong Kim, Norio Kawakami, and Hideaki Obuse
    • Journal Title

      Physical Review A

      Volume: 102 Issue: 6

    • DOI

      10.1103/physreva.102.062202

    • NAID

      120006954266

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Statistical properties of eigenvalues of the non-Hermitian Su-Schrieffer-Heeger model with random hopping terms2020

    • Author(s)
      Ken Mochizuki, Naomichi Hatano, Joshua Feinberg, and Hideaki Obuse
    • Journal Title

      Physical Review E

      Volume: 102 Issue: 1 Pages: 012101-012101

    • DOI

      10.1103/physreve.102.012101

    • NAID

      120006880728

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Topological Quantum Walk with Discrete Time-Glide Symmetry2020

    • Author(s)
      Ken Mochizuki, Takumi Bessho, Masatoshi Sato, and Hideaki Obuse
    • Journal Title

      Physical Review B

      Volume: 102 Issue: 3

    • DOI

      10.1103/physrevb.102.035418

    • NAID

      120006880727

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Loss tolerant quantum absorption measurement2020

    • Author(s)
      Okamoto Ryo、Tokami Yuta、Takeuchi Shigeki
    • Journal Title

      New Journal of Physics

      Volume: 22 Issue: 10 Pages: 103016-103016

    • DOI

      10.1088/1367-2630/abbab4

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Stability of topologically protected edge states in nonlinear quantum walks: additional bifurcations unique to Floquet systems2020

    • Author(s)
      Mochizuki Ken、Kawakami Norio、Obuse Hideaki
    • Journal Title

      Journal of Physics A: Mathematical and Theoretical

      Volume: 53 Issue: 8 Pages: 085702-085702

    • DOI

      10.1088/1751-8121/ab6514

    • NAID

      120006980035

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Presentation] Stability of topological edge states in nonlinear quantum walks: Bifurcations unique to Floquet systems2021

    • Author(s)
      Ken Mochizuki, Norio Kawakami, and Hideaki Obuse
    • Organizer
      APS March Meeting 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Statistical Properties of the Non-Hermitian SSH Model and Symmetry Inheritance owing to Real Spectra2021

    • Author(s)
      Ken Mochizuki, Naomichi Hatano, Joshua Feinberg, and Hideaki Obuse
    • Organizer
      APS March Meeting 2021
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 開放系・フロケ系を探索する舞台としての量子ウォーク2021

    • Author(s)
      望月健, 別所拓実, 佐藤昌利, 金多景, 川上則雄, 小布施秀明
    • Organizer
      日本物理学会第76回年次大会(2021年)
    • Related Report
      2020 Annual Research Report
  • [Presentation] 量子ウォーク系におけるバルクエッジ対応の破れ2021

    • Author(s)
      別所拓実, 望月健, 佐藤昌利, 小布施秀明
    • Organizer
      日本物理学会第76回年次大会(2021年)
    • Related Report
      2020 Annual Research Report
  • [Presentation] Photonic quantum technologies for quantum sensing: from quantum absorption measurement to quantum state estimation2021

    • Author(s)
      Ryo Okamoto
    • Organizer
      SPIE photonics west 2021
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] Quantum walks, Anderson localization, and Non-Hermitian physics2020

    • Author(s)
      Hideaki Obuse
    • Organizer
      Localisation 2020
    • Related Report
      2020 Annual Research Report
    • Int'l Joint Research
  • [Presentation] 開放系量子ウォークにおけるトポロジカル相2020

    • Author(s)
      小布施秀明
    • Organizer
      RIMS 共同研究 開放系 QW とトポロジカル相の数理
    • Related Report
      2020 Annual Research Report
    • Invited
  • [Presentation] カイラル対称性を有する一次元開放フロケ系におけるバルクエッジ対応2020

    • Author(s)
      望月健, 金多景, 川上則雄, 小布施秀明
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 例外点を用いた非エルミート光学式ジャイロスコープの分解能2020

    • Author(s)
      河崎真樹男, 小布施秀明
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] 2次元2自由度量子ウォークにおける量子探索の最適探索時間の評価2020

    • Author(s)
      武田紘明, 川上則雄, 岡本亮, 小布施秀明
    • Organizer
      日本物理学会2020年秋季大会
    • Related Report
      2020 Annual Research Report
  • [Presentation] Bulk-edge correspondence and stability of multiple edge states in PT symmetric non-unitary quantum walks2020

    • Author(s)
      Hideaki Obuse
    • Organizer
      Topological phenomena in non-Hermitian and non-equilibrium systems, 2020
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] PT symmetric non-unitary quantum walks with higher topological numbers2019

    • Author(s)
      Hideaki Obuse
    • Organizer
      IIS-Chiba Workshop NH2019
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] PT symmetric non-unitary quantum walks with higher topological numbers2019

    • Author(s)
      Hideaki Obuse
    • Organizer
      Workshop on recent topics of condensed matter physics
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 光子を用いた量子情報科学技術2019

    • Author(s)
      岡本 亮
    • Organizer
      非エルミート系および光学実験に関する研究会
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Topological Phases on Non-Hermitian systems with PT symmetry: Quantum Walk Approach2019

    • Author(s)
      Hideaki Obuse
    • Organizer
      Topological Material Science: 4th Annual Meeting
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] PT対称な非エルミート系におけるトポロジカル相と実証実験:量子ウォークによるアプローチ2019

    • Author(s)
      小布施 秀明
    • Organizer
      日本物理学会第74回年次大会 領域4,1,5,11合同シンポジウム「非エルミート量子力学の新展開」
    • Related Report
      2018 Research-status Report
    • Invited
  • [Presentation] Photonic quantum circuits for quantum measurement2018

    • Author(s)
      岡本 亮
    • Organizer
      Asia-Pacific Laser Symposium 2018
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Edge states in PT symmetric quantum walks with higher topological numbers2018

    • Author(s)
      Hideaki Obuse
    • Organizer
      Non-Hermitian Physics - PHHQP XVIII
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] トポロジカル相と対称性を活用した量子状態制御 : 量子ウォークによるアプローチ2018

    • Author(s)
      小布施 秀明
    • Organizer
      量子情報・物性の新潮流
    • Related Report
      2018 Research-status Report
  • [Presentation] Topological phases on PT symmetric non-unitary quantum walks2018

    • Author(s)
      Hideaki Obuse
    • Organizer
      second TMS-PKU allianace workshop in Beijing
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] PT対称な非エルミート系におけるトポロジカル相と実証実験:量子ウォークによるアプローチ2018

    • Author(s)
      小布施 秀明
    • Organizer
      第10回トポロジー連携研究会「非平衡系・非エルミート系の新奇量子現象」
    • Related Report
      2018 Research-status Report
    • Invited

URL: 

Published: 2018-07-25   Modified: 2022-01-27  

Information User Guide FAQ News Terms of Use Attribution of KAKENHI

Powered by NII kakenhi