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Quantumness and multipartite entanglement in primordial fluctuation

Research Project

Project/Area Number 19K03866
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionNagoya University

Principal Investigator

Nambu Yasusada  名古屋大学, 理学研究科, 准教授 (40212112)

Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,420,000 (Direct Cost: ¥3,400,000、Indirect Cost: ¥1,020,000)
Fiscal Year 2022: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2021: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2020: ¥1,170,000 (Direct Cost: ¥900,000、Indirect Cost: ¥270,000)
Fiscal Year 2019: ¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Keywords原始量子ゆらぎ / 量子古典転移 / 量子もつれ / エンタングルメント / entanglement partner / entanglement monogamy / インフレーション宇宙 / インフレーション / モノガミー / 純粋化 / モノガミー性 / 量子情報カプセル / 多体間エンタングルメント / 原始ゆらぎの量子性 / ゆらぎの古典性
Outline of Research at the Start

現在の宇宙の大規模構造は,宇宙初期のインフレーション膨張期に生成された量子ゆらぎが進化したものであると考えられている.しかしながら,量子ゆらぎが宇宙の構造につながる古典ゆらぎ に転化するメカニズニムについては十分な理解がされているとは言い難い(原始量子ゆらぎの古典化問題).本研究では,インフレーション起源のゆらぎの量子性並びにその古典性の意味を,量子状 態の持つエンタングルメントのモノガミー性に基づいて解明する.また,観測的に初期宇宙の量子性を検証する手法として,強度相関の方法の可能性について検討を行う.

Outline of Final Research Achievements

We consider purification of the target bipartite state AB by applying the partner formula and obtain a 4-mode pure Gaussian state which embed the mode AB. Then using a monogamy relation between the "internal entanglement" and the "external entanglement" proposed by S. Camalet, we have shown that negativities N(A:B) and N(AB:CD) obey a trade-off relation and this monogamy relation provides a sufficient condition of separability of the AB.

Academic Significance and Societal Importance of the Research Achievements

エンタングルメントパートナーとモノガミーの観点よりインフレーション宇宙における古典相関の生成過程の理解が可能となった.今後の発展としては,パートナー公式を用いることで得られるパートナーモードの空間プロファイルを用いて,情報量の共有が時間と共にどのように変化してゆくかを見ていく.そして情報量の共有拡散の観点より,インフレーション宇宙における古典化の理解をさらに深める.

Report

(5 results)
  • 2022 Annual Research Report   Final Research Report ( PDF )
  • 2021 Research-status Report
  • 2020 Research-status Report
  • 2019 Research-status Report
  • Research Products

    (21 results)

All 2023 2022 2021 2020 2019

All Journal Article (12 results) (of which Peer Reviewed: 12 results,  Open Access: 3 results) Presentation (9 results) (of which Int'l Joint Research: 4 results,  Invited: 8 results)

  • [Journal Article] Analog de Sitter universe in quantum Hall systems with an expanding edge2023

    • Author(s)
      Nambu, Y., & Hotta, M.
    • Journal Title

      Physical Review D

      Volume: 107

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Particle creation and entanglement in a dispersive model with step velocity profile2023

    • Author(s)
      Osawa, Y., & Nambu, Y.
    • Journal Title

      Physical Review D

      Volume: 107 Pages: 105005-105005

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Leggett-Garg inequalities for testing quantumness of gravity2022

    • Author(s)
      Matsumura, A., Nambu, Y., & Yamamoto, K.
    • Journal Title

      Physical Review A

      Volume: 106

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Entanglement Renyi entropy of two disjoint intervals for large $c$ Liouville field theory.2022

    • Author(s)
      Tsujimura, J., & Nambu, Y.
    • Journal Title

      Entropy

      Volume: 24 Pages: 1758-1758

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Quantumness of gravity in harmonically trapped particles2022

    • Author(s)
      Kaku, Y., Maeda, S., Nambu, Y., & Osawa, Y.
    • Journal Title

      Physical Review D

      Volume: 106 Pages: 126005-126005

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Expanding edges of quantum Hall systems in a cosmology language: Hawking radiation from de Sitter horizon in edge modes2022

    • Author(s)
      Hotta, M., Nambu, Y., Sugiyama, Y., Yamamoto, K., & Yusa, G.
    • Journal Title

      Physical Review D

      Volume: 105 Pages: 105009-105009

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Qubit clock in quantum cosmology2022

    • Author(s)
      Y. Nambu
    • Journal Title

      Universe

      Volume: 8 Issue: 2 Pages: 99-99

    • DOI

      10.3390/universe8020099

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Interferomety of black holes with Hawking radiation2022

    • Author(s)
      Y. Nambu and S. Noda
    • Journal Title

      Phys. Rev. D

      Volume: 105 Issue: 4 Pages: 045022-045022

    • DOI

      10.1103/physrevd.105.045022

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Tripartite entanglement of Hawking radiation in dispersive model2021

    • Author(s)
      Y. Nambu and Y. Osawa
    • Journal Title

      Phys. Rev. D

      Volume: 103 Issue: 12 Pages: 125007-125007

    • DOI

      10.1103/physrevd.103.125007

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Null Wave Front and Ryu-Takayanagi Surface2020

    • Author(s)
      Jun Tsujimura and Yasusada Nambu
    • Journal Title

      Entropy

      Volume: 22 Issue: 11 Pages: 1297-1297

    • DOI

      10.3390/e22111297

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Violation of Bell-CHSH Inequalities through Optimal Local Filters in the Vacuum2020

    • Author(s)
      Akira Matsumura and Yasusada Nambu
    • Journal Title

      Quantum Reports

      Volume: 2 Issue: 4 Pages: 542-559

    • DOI

      10.3390/quantum2040038

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Squeezing of Primordial Gravitational Waves as Quantum Discord2020

    • Author(s)
      A. Matsumura and Y. Nambu
    • Journal Title

      Universe

      Volume: 6 Issue: 2 Pages: 33-33

    • DOI

      10.3390/universe6020033

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Analog de Sitter universe in quantum Hall systems with an expanding edge2023

    • Author(s)
      Y. Nambu
    • Organizer
      ブラックホール磁気圏研究会
    • Related Report
      2022 Annual Research Report
    • Invited
  • [Presentation] Entanglement partner in de Sitter universe2023

    • Author(s)
      Y. Nambu
    • Organizer
      Gravity and Quantum
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Inteferomety of black holes with Hawking radiation2022

    • Author(s)
      Y. Nambu
    • Organizer
      ブラックホール磁気圏研究会
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 重力がLG不等式の破れに与える影響2021

    • Author(s)
      S. Maeda, A. Kaku, Y. Nambu, Y. Osawa
    • Organizer
      巨視的量子現象と量子重力
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 量子時計と重力2021

    • Author(s)
      Y. Nambu
    • Organizer
      巨視的量子現象と量子重力
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] Entanglement partner of super horizon modes2021

    • Author(s)
      Yasusada Nambu
    • Organizer
      Recent progress in theoretical physics based on quantum information theory
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Multipratite entanglement in black hole evaporation and primordial fluctuations2019

    • Author(s)
      Y. Nambu
    • Organizer
      Relativistic Quantum Information North (RQI-N 2019)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] インフレーションの数理:原始ゆらぎの量子性2019

    • Author(s)
      Y. Nambu
    • Organizer
      日本物理学会 (九州大学 )
    • Related Report
      2019 Research-status Report
    • Invited
  • [Presentation] Quantum circuit model of black hole evaporation2019

    • Author(s)
      Y. Nambu
    • Organizer
      quantum information and string theory (YITP)
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research

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Published: 2019-04-18   Modified: 2024-01-30  

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