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Quantum information theoretical study on bounds on quantum nonlocality

Research Project

Project/Area Number 17K05579
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Research Field Mathematical physics/Fundamental condensed matter physics
Research InstitutionHiroshima University

Principal Investigator

Ishizaka Satoshi  広島大学, 先進理工系科学研究科(総), 教授 (10443631)

Co-Investigator(Kenkyū-buntansha) 畠中 憲之  広島大学, 先進理工系科学研究科(総), 教授 (70363009)
Project Period (FY) 2017-04-01 – 2021-03-31
Project Status Completed (Fiscal Year 2020)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2019: ¥1,950,000 (Direct Cost: ¥1,500,000、Indirect Cost: ¥450,000)
Fiscal Year 2018: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2017: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords量子相関 / 量子非局所性 / ベル不等式 / 自己テスト / チレルソン限界 / 量子不確定性 / device-independent / 量子エンタングルメント / 量子相関限界 / エンタングルメント / 物性基礎論 / 量子情報
Outline of Final Research Achievements

The outcomes of measurements on entangled quantum states are correlated in a novel way such that it violates Bell's inequality. However, the analytical criterion for identifying the boundaries between quantum and postquantum correlations has not yet been given, even in the simplest Bell scenario. We succeeded to obtain a plausible, analytical, necessary and sufficient condition ensuring that a nonlocal quantum correlation in the simplest scenario is an extremal boundary point. Extensive numerical calculations strongly support this conjectured criterion. Moreover, we suggested that the extremality is possibly certified by only verifying whether the CHSH violation exceeds a certain threshold. We also constructed self-testing protocols, which is superior in that, by using this as a building block and repeatedly adding measurements, a realization with an arbitrary number of measurements can be self-tested.

Academic Significance and Societal Importance of the Research Achievements

量子相関限界を規定している基本的な物理原理を探すための研究が近年活発に行われているが、量子相関限界を同定するための解析的条件が得られていないことが深刻な問題の一つとなっていた。厳密な数学的証明には至っていないものの、解析的条件の導出は数十年に渡る未解決問題であり、数値的に妥当な解析的条件の導出に成功した学術的意義は大きいと考えている。また、自己テストプロトコルは、デバイスの詳細に依存しない量子情報処理の中核技術の一つであり、量子暗号通信や真性乱数発生などの応用にとって重要である。複雑な量子系を系統的に自己テストする方法を与えるプロトコルが構築できたことは、応用上の意義が大きいと考えている。

Report

(5 results)
  • 2020 Annual Research Report   Final Research Report ( PDF )
  • 2019 Research-status Report
  • 2018 Research-status Report
  • 2017 Research-status Report
  • Research Products

    (11 results)

All 2020 2019 2018 2017

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 2 results) Presentation (8 results) (of which Int'l Joint Research: 4 results)

  • [Journal Article] Quantum limit of genuine tripartite correlations by bipartite extremality2020

    • Author(s)
      Ozeki Hiroyuki、Ishizaka Satoshi
    • Journal Title

      International Journal of Quantum Information

      Volume: 18 Issue: 04 Pages: 2050014-2050014

    • DOI

      10.1142/s0219749920500148

    • NAID

      130008157625

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Geometrical self-testing of partially entangled two-qubit states2020

    • Author(s)
      Ishizaka Satoshi
    • Journal Title

      New Journal of Physics

      Volume: 22 Issue: 2 Pages: 023022-023022

    • DOI

      10.1088/1367-2630/ab6e49

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Necessary and sufficient criterion for extremal quantum correlations in the simplest Bell scenario2018

    • Author(s)
      Ishizaka Satoshi
    • Journal Title

      Physical Review A

      Volume: 97 Issue: 5

    • DOI

      10.1103/physreva.97.050102

    • Related Report
      2018 Research-status Report
    • Peer Reviewed
  • [Presentation] 2者間の極値性による真の3者間の量子相関限界の分析2020

    • Author(s)
      尾関寛之, 石坂智
    • Organizer
      日本物理学会 第75回年会
    • Related Report
      2019 Research-status Report
  • [Presentation] A simple scheme to ensure extremal Bell nonlocality2019

    • Author(s)
      H. Ozeki and S. Ishizaka
    • Organizer
      2019 the 3rd International Conference on Materials Engineering and Nano Sciences (ICMENS 2019)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Analytical criterion for extremal quantum correlations in the simplest Bell scenario2018

    • Author(s)
      S. Ishizaka
    • Organizer
      The 13th Conference on the Theory of Quantum Computation, Communication and Cryptography (TQC 2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] Necessary and sufficient criterion for extremal quantum correlations in the simplest Bell scenario2018

    • Author(s)
      S. Ishizaka
    • Organizer
      18th Asian Quantum Information Science Conference (AQIS 2018)
    • Related Report
      2018 Research-status Report
    • Int'l Joint Research
  • [Presentation] 量子相関限界の解析的条件2018

    • Author(s)
      石坂智
    • Organizer
      第38回量子情報技術研究会 (QIT38)
    • Related Report
      2018 Research-status Report
  • [Presentation] W状態で最大に破れるBell不等式2018

    • Author(s)
      尾関寛之, 石坂智
    • Organizer
      第38回量子情報技術研究会 (QIT38)
    • Related Report
      2018 Research-status Report
  • [Presentation] 非局所相関の暗号的量子限界2017

    • Author(s)
      石坂智
    • Organizer
      第36回量子情報技術研究会
    • Related Report
      2017 Research-status Report
  • [Presentation] Cryptographic quantum bound on nonlocality2017

    • Author(s)
      Satoshi Ishizaka
    • Organizer
      17th Asian Quantum Information Science Conference
    • Related Report
      2017 Research-status Report
    • Int'l Joint Research

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Published: 2017-04-28   Modified: 2022-01-27  

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