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Clarification of the mathematical structure of quantum-classical hybrid systems based on operational properties of measurement and its applications

Research Project

Project/Area Number 19K03658
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 13010:Mathematical physics and fundamental theory of condensed matter physics-related
Research InstitutionTamagawa University

Principal Investigator

NAKAHIRA Kenji  玉川大学, 量子情報科学研究所, 教授 (90804005)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥3,510,000 (Direct Cost: ¥2,700,000、Indirect Cost: ¥810,000)
Fiscal Year 2021: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2020: ¥1,560,000 (Direct Cost: ¥1,200,000、Indirect Cost: ¥360,000)
Fiscal Year 2019: ¥910,000 (Direct Cost: ¥700,000、Indirect Cost: ¥210,000)
Keywords量子論 / 量子情報理論 / 操作的確率論 / 量子プロセス識別 / 量子古典混合系
Outline of Research at the Start

量子情報理論において量子論の特徴を最大限に活用するためには,量子系のみならず古典系およびそれらの混合系に対する情報理論的な性質を深く理解することが重要である。近年,少数個の直観的な原理のみを用いて量子系と古典系の数理構造を導出できることが示され,両系に対する理解が深まっている。一方,量子古典混合系の数理構造については同様の原理のみから導出するには至っていない。
本研究では,量子測定が持つ操作的な性質に着目して原理を構築することで本系の数理構造を導出できる可能性があるという着想を得た。直観的な原理から量子古典混合系の数理構造を導出し,本系の情報理論的な性質について理解を深めることをめざす。

Outline of Final Research Achievements

We showed that the mathematical structure of quantum theory including quantum-classical hybrid systems can be reconstructed from the operational probabilistic theory and four operational postulates. We also developed a method for finding the optimal discrimination of quantum processes. Specifically, we developed a method to formulate a wide class of quantum process discrimination problems as convex programming problems, derived necessary and sufficient conditions for optimality, and obtained upper and lower bounds on the optimal performance.

Academic Significance and Societal Importance of the Research Achievements

複素ヒルベルト空間などの抽象的な数学の概念を前提とせずに量子論の数理構造を特徴付けることは,量子論における長年の課題である。本研究では,操作的・確率的な言葉で述べられた要請のみを用いて,(量子古典混合系を含む)量子論の数理構造を導けることを示した。これにより,できるだけ直観的な概念のみを用いて量子論を特徴付けるための一つの方向性を示した点が,本研究成果の学術的意義や社会的意義である。また,量子プロセスの最適識別を求めるための手法を開発したことで,識別という基本的な操作における物理性能限界を解析することを可能にした。

Report

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

    (12 results)

All 2021 2020 2019

All Journal Article (7 results) (of which Peer Reviewed: 7 results,  Open Access: 2 results) Presentation (5 results) (of which Int'l Joint Research: 2 results)

  • [Journal Article] Simple Upper and Lower Bounds on the Ultimate Success Probability for Discriminating Arbitrary Finite-Dimensional Quantum Processes2021

    • Author(s)
      K. Nakahira and K. Kato
    • Journal Title

      Physical Review Letters

      Volume: 126 Issue: 20 Pages: 200502-200502

    • DOI

      10.1103/physrevlett.126.200502

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Generalized quantum process discrimination problems2021

    • Author(s)
      K. Nakahira and K. Kato
    • Journal Title

      Physical Review A

      Volume: 103 Issue: 6 Pages: 062606-062606

    • DOI

      10.1103/physreva.103.062606

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Quantum process discrimination with restricted strategies2021

    • Author(s)
      K. Nakahira
    • Journal Title

      Physical Review A

      Volume: 104 Issue: 6 Pages: 062609-062609

    • DOI

      10.1103/physreva.104.062609

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Efficient implementation of quantum orthogonal wavelet transforms and their undecimated versions2021

    • Author(s)
      K. Nakahira
    • Journal Title

      Tamagawa University Quantum ICT Research Institute Bulletin

      Volume: 11 Pages: 7-7

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Diagrammatic representation of quantum testers for discriminating between quantum processes2020

    • Author(s)
      Kenji Nakahira
    • Journal Title

      Tamagawa University Quantum ICT Research Institute Bulletin

      Volume: 10 Pages: 23-28

    • NAID

      40022525826

    • Related Report
      2020 Research-status Report
    • Peer Reviewed
  • [Journal Article] Derivation of quantum theory with superselection rules2020

    • Author(s)
      Kenji Nakahira
    • Journal Title

      Physical Review A

      Volume: 101 Issue: 2 Pages: 022104-022104

    • DOI

      10.1103/physreva.101.022104

    • Related Report
      2019 Research-status Report
    • Peer Reviewed
  • [Journal Article] Discrimination of symmetric states in operational probabilistic theory2020

    • Author(s)
      Kenji Nakahira
    • Journal Title

      Tamagawa University Quantum ICT Research Institute Bulletin

      Volume: 9 Pages: 15-22

    • NAID

      40022193813

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Relation of ‘α-order Renyi’ subentropy and mutual information2019

    • Author(s)
      Keisuke Sato, Souichi Takahira, Kenji Nakahira, Tsuyoshi Sasaki Usuda
    • Organizer
      19th Asian Quantum Information Science Conference (AQIS2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] Design criteria for a robust quantum receiver in the presence of phase noise2019

    • Author(s)
      Tiancheng Wang, Kenji Nakahira, Tsuyoshi Sasaki Usuda
    • Organizer
      19th Asian Quantum Information Science Conference (AQIS2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research
  • [Presentation] 群共変的量子情報源のアクセシブルレニー情報量の上界2019

    • Author(s)
      佐藤圭介, 高比良宗一, 中平健治, 臼田毅
    • Organizer
      第42回情報理論とその応用シンポジウム
    • Related Report
      2019 Research-status Report
  • [Presentation] 操作的な原理を用いた量子古典混合システムを含む量子論の再構築2019

    • Author(s)
      中平健治
    • Organizer
      第42回情報理論とその応用シンポジウム
    • Related Report
      2019 Research-status Report
  • [Presentation] 位相雑音耐性の高い量子受信機の設計規準について2019

    • Author(s)
      王天澄, 中平健治, 臼田毅
    • Organizer
      第42回情報理論とその応用シンポジウム
    • Related Report
      2019 Research-status Report

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

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