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New Approach in Particle and Quantum Physics Based on Weak Value and Weak Measurement

Research Project

Project/Area Number 20H01906
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionHigh Energy Accelerator Research Organization

Principal Investigator

Tsutsui Izumi  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 特別准教授 (10262106)

Co-Investigator(Kenkyū-buntansha) 李 宰河  東京大学, 生産技術研究所, 助教 (20816607)
田窪 洋介  大学共同利用機関法人高エネルギー加速器研究機構, 素粒子原子核研究所, 研究機関講師 (50423124)
長谷川 祐司  北海道大学, 工学研究院, 教授 (60282498)
Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥16,380,000 (Direct Cost: ¥12,600,000、Indirect Cost: ¥3,780,000)
Fiscal Year 2022: ¥4,940,000 (Direct Cost: ¥3,800,000、Indirect Cost: ¥1,140,000)
Fiscal Year 2021: ¥5,200,000 (Direct Cost: ¥4,000,000、Indirect Cost: ¥1,200,000)
Fiscal Year 2020: ¥6,240,000 (Direct Cost: ¥4,800,000、Indirect Cost: ¥1,440,000)
Keywordsweak value / weak measurement / Bell inequality / quantum randomness / uncertainty relation / 弱値 / 弱測定 / 量子共鳴 / 量子乱数 / ベル不等式 / 量子測定 / 不確定性関係 / 乱数生成 / 電気双極子モーメント / CP対称性 / Bell不等式 / 量子測定誤差 / CPの破れ / B中間子
Outline of Research at the Start

量子力学では、実測可能な量を物理量演算子の「固有値」(または「期待値」)と呼ばれるものに限定しており、粒子の位置や運動量はその代表例である。ところが近年、これを越えた「弱値」と呼ばれる量が注目され、実際にいくつかの対象に測定が進められるようになっている。波動関数の測定はその一例である。
本研究は、この「弱値」の物理的な意味やその量子現象の特徴は何かを調べることで、量子の世界を深く知ろうとするものである。また、「弱値」を測る「弱測定」という方法によって実現される増幅効果を用いて、素粒子の標準模型を越える未知の素粒子反応を見つけるなど、新しい物理現象の探索を行うことを目的としている。

Outline of Final Research Achievements

In this project, we established a general class of uncertainty relations related to the weak value. Also, through the weak measurement in neutron interferometry we confirmed the separable nature of reality of physical quantities. This indicates that the weak value represents the sensitivity of physical interactions which yield the transition of states specified in weak measurement, and this is exemplified by the connection between the quantum resonance and the weak value amplification. As application, we propose the use of prolongation of lifetime in the weak value for precision measurement of the CP violation. We also examine the feasibility of the Bell test in the Atlas experiment at CERN with entangled B meson pairs. As a by-product, we showed that a secure random number generation is possible from parity symmetric radiations, while the quantum randomness is hardly distinguishable from pseudo-randomness under standard randomness measures such as the Borel normality.

Academic Significance and Societal Importance of the Research Achievements

本研究の学術的意義は、量子力学の基礎問題の一つである物理量の実在性に関して、弱値の概念に基づいて新しい知見を得たことである。端的に言えば、弱値は不確定性関係における中核的概念であり、また遷移確率振幅における測定物理量の感度に相当し、これに基づく考察から1粒子の持つ複数の物理量の分離性が確証される。また量子共鳴現象は実質的には弱値の増幅現象に他ならない。本研究は、弱値を利用した測定はCPの破れなど素粒子物理学の新しい実験方法を提供し、また逆にB中間子対の崩壊現象を利用したベル不等式の検証実験を可能にするなど、多様な物理分野での相互的な貢献が期待される点で、社会的意義があるものと考えられる。

Report

(4 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • Research Products

    (18 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (2 results) Journal Article (7 results) (of which Int'l Joint Research: 2 results,  Peer Reviewed: 7 results,  Open Access: 3 results) Presentation (5 results) (of which Int'l Joint Research: 1 results,  Invited: 3 results) Remarks (4 results)

  • [Int'l Joint Research] Israel Institute of Technology(イスラエル)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Atominstitut, TU Wien(オーストリア)

    • Related Report
      2020 Annual Research Report
  • [Journal Article] Indistinguishability between quantum randomness and pseudorandomness under efficiently calculable randomness measures2024

    • Author(s)
      Toyohiro Tsurumaru, Tsubasa Ichikawa, Yosuke Takubo, Toshihiko Sasaki, Jaeha Lee, Izumi Tsutsui
    • Journal Title

      Physical Review A

      Volume: 109 Issue: 2 Pages: 022243-022243

    • DOI

      10.1103/physreva.109.022243

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Secure random number generation from parity symmetric radiations2022

    • Author(s)
      Toyohiro Tsurumaru, Toshihiko Sasaki and Izumi Tsutsui
    • Journal Title

      COMMUNICATIONS PHYSICS

      Volume: 5, 147 Issue: 1 Pages: 1-8

    • DOI

      10.1038/s42005-022-00915-1

    • NAID

      130008157019

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Feasibility of Bell Inequality Violation at the ATLAS Experiment with Flavor Entanglement of B0 bar B0 Pairs from pp Collisions2021

    • Author(s)
      Takubo Yosuke、Ichikawa Tsubasa、Higashino Satoshi、Mori Yuichiro、Nagano Kunihiro、Tsutsui Izumi
    • Journal Title

      Physical Review D

      Volume: 104 Issue: 5 Pages: 056004-056004

    • DOI

      10.1103/physrevd.104.056004

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Weak-value amplification and the lifetime of a decaying particle2021

    • Author(s)
      Yuichiro Mori and Izumi Tsutsui
    • Journal Title

      Phys. Rev. A.

      Volume: 104 Issue: 3 Pages: 032202-032202

    • DOI

      10.1103/physreva.104.032202

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Weak value amplification in high energy physics: A case study for precision measurement of C P violation in B meson decays2021

    • Author(s)
      Satoshi Higashino, Yuichiro Mori, Yosuke Takubo, Takeo Higuchi, Akimasa Ishikawa, and Izumi Tsutsui
    • Journal Title

      Phys. Rev. D

      Volume: 104 Issue: 3 Pages: 033001-033001

    • DOI

      10.1103/physrevd.104.033001

    • NAID

      120007144970

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Tests of fundamental quantum mechanics and dark interactions with low-energy neutrons2021

    • Author(s)
      Sponar Stephan、Sedmik Ren? I. P.、Pitschmann Mario、Abele Hartmut、Hasegawa Yuji
    • Journal Title

      Nature Reviews Physics

      Volume: 3 Issue: 5 Pages: 309-327

    • DOI

      10.1038/s42254-021-00298-2

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Neutron optical test of completeness of quantum root-mean-square errors2021

    • Author(s)
      Sponar Stephan、Danner Armin、Ozawa Masanao、Hasegawa Yuji
    • Journal Title

      npj Quantum Information

      Volume: 7 Issue: 1 Pages: 1-1

    • DOI

      10.1038/s41534-021-00437-8

    • Related Report
      2021 Annual Research Report 2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] 素粒子物理と量子基礎の研究について2024

    • Author(s)
      筒井 泉
    • Organizer
      Quantum Foundations
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] 量子力学の基礎と高エネルギー物理2023

    • Author(s)
      筒井 泉
    • Organizer
      Flavor Physics Workshop 2023 (FPWS2023)
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] LHC-ATLAS実験におけるB中間子対を用いたベルの不等式の破れに対する感度評価2023

    • Author(s)
      辻川吉明, 隅田土詞, 長野邦浩, 田窪洋介
    • Organizer
      日本物理学会第78回年次大会
    • Related Report
      2022 Annual Research Report
  • [Presentation] B 中間子崩壊に見る素粒子物理と量子力学の基礎との交流2022

    • Author(s)
      筒井 泉
    • Organizer
      時間・量子測定・準古典近似の理論と実験~古典論と量子論の境界
    • Related Report
      2021 Annual Research Report
    • Invited
  • [Presentation] On the Feasibility of Bell Inequality Violation at ATLAS Experiment with Flavor En- tanglement of BB Pairs from pp Collisions2021

    • Author(s)
      Y. Takubo
    • Organizer
      CERN Top working group plenary (October 2021)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Remarks] 理想的な乱数実現へ -「パリティ対称性」利用が有効-

    • URL

      https://www2.kek.jp/ipns/ja/news/3194/

    • Related Report
      2021 Annual Research Report
  • [Remarks] 理想的な乱数実現へ ―「パリティ対称性」利用が有効―

    • URL

      https://www.t.u-tokyo.ac.jp/press/pr2022-07-07-002

    • Related Report
      2021 Annual Research Report
  • [Remarks] Test of completeness of quantum rms errors

    • URL

      http://www.neutroninterferometry.com/home/latestnews/test-of-completeness-of-quantum-root-mean-square-errors

    • Related Report
      2020 Annual Research Report
  • [Remarks] 量子系の測定に内在する隠れた誤差の検証実験に成功

    • URL

      https://www.chubu.ac.jp/news/1314/

    • Related Report
      2020 Annual Research Report

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Published: 2020-04-28   Modified: 2025-01-30  

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