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Study on the mechanism behind thermalization and quantum chaos based on the information scrambling

Research Project

Project/Area Number 19K14724
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 15010:Theoretical studies related to particle-, nuclear-, cosmic ray and astro-physics
Research InstitutionInstitute of Physical and Chemical Research

Principal Investigator

NOZAKI MASAHIRO  国立研究開発法人理化学研究所, 数理創造プログラム, 基礎科学特別研究員 (20804777)

Project Period (FY) 2019-04-01 – 2022-03-31
Project Status Completed (Fiscal Year 2021)
Budget Amount *help
¥4,160,000 (Direct Cost: ¥3,200,000、Indirect Cost: ¥960,000)
Fiscal Year 2021: ¥780,000 (Direct Cost: ¥600,000、Indirect Cost: ¥180,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Fiscal Year 2019: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords量子もつれ / 非平衡現象 / information scrambling / ホログラフィー / 熱化 / 量子カオス / エンタングルメント・エントロピー / 非平衡 / 量子情報 / ゲージ/重力対応 / スクランブリング / 非一様性
Outline of Research at the Start

本研究の目的は情報のスクランブリングという現象を定量的に理解することによって、熱化と量子カオスの両現象のメカニズムを定量的に解明することである。熱化・量子カオスは非平衡過程を深く理解する上で重要な現象であるが初期状態と系のダイナミクスに依存した非常に複雑な現象であるため、これらの現象のメカニズムを直接的に解明することは困難を極める。一方で両者に共通した、ダイナミクスに強く依存する、重要な現象として局所的に初期状態の情報が失われる情報のスクランブリングがある。申請者はこの現象を解明することにより、熱化・量子カオスのメカニズム、両者の関係、そしてより一般的な系の量子カオスの性質を定量的に解明する。

Outline of Final Research Achievements

The goal of this research is to elucidate how thermalization, a characteristic phenomenon of the macroscopic world, occurs from the microscopic world in terms of quantum mechanics, which describes the microscopic world. We found that an effect called the scrambling effect, which locally hides the features of the initial state, is important in this nonequilibrium process. Furthermore, we found that by adding inhomogeneity to the dynamics, it is possible to preserve the characteristics of this initial state, depending on the location.

Academic Significance and Societal Importance of the Research Achievements

本研究テーマである熱化現象とは、状態の量子性、つまりミクロな世界に特有の量子状態の性質が失われていく過程のことである。本研究成果の学術的意義と社会的意義のそれぞれは、状態の量子性が非平衡過程で失われていくメカニズムがより明らかになったことと、これにより、状態の量子性が重要な役割をなす量子コンピュータなどを実装する際にどの様な操作を行うべきかがより明らかになった点である。

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 Other

All Int'l Joint Research (3 results) Journal Article (6 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 6 results,  Open Access: 3 results) Presentation (3 results) (of which Int'l Joint Research: 3 results,  Invited: 1 results)

  • [Int'l Joint Research] プリンストン大学(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] プリンストン大学/シカゴ大学/イリノイ大学(米国)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] シカゴ大学/ケンタッキー大学/UCB(米国)

    • Related Report
      2019 Research-status Report
  • [Journal Article] Subregion spectrum form factor via pseudoentropy2021

    • Author(s)
      Goto Kanato、Nozaki Masahiro、Tamaoka Kotaro
    • Journal Title

      Physical Review D

      Volume: 104 Issue: 12 Pages: 1-6

    • DOI

      10.1103/physrevd.104.l121902

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Entanglement of local operators and the butterfly effect2021

    • Author(s)
      Kudler-Flam Jonah、Nozaki Masahiro、Ryu Shinsei、Tan Mao Tian
    • Journal Title

      Physical Review Research

      Volume: 3 Issue: 3 Pages: 1-25

    • DOI

      10.1103/physrevresearch.3.033182

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Quantum vs. classical information: operator negativity as a probe of scrambling2020

    • Author(s)
      Kudler-Flam Jonah、Nozaki Masahiro、Ryu Shinsei、Tan Mao Tian
    • Journal Title

      Journal of High Energy Physics

      Volume: 2020 Issue: 1 Pages: 31-31

    • DOI

      10.1007/jhep01(2020)031

    • Related Report
      2020 Research-status Report 2019 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Signature of quantum chaos in operator entanglement in 2d CFTs2019

    • Author(s)
      Nie Laimei、Nozaki Masahiro、Ryu Shinsei、Tan Mao Tian
    • Journal Title

      Journal of Statistical Mechanics: Theory and Experiment

      Volume: 2019 Issue: 9 Pages: 093107-093107

    • DOI

      10.1088/1742-5468/ab3a29

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Holographic duals of inhomogeneous systems: the rainbow chain and the sine-square deformation model2019

    • Author(s)
      MacCormack Ian、Liu Aike、Nozaki Masahiro、Ryu Shinsei
    • Journal Title

      Journal of Physics A: Mathematical and Theoretical

      Volume: 52 Issue: 50 Pages: 505401-505401

    • DOI

      10.1088/1751-8121/ab3944

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Entanglement after quantum quenches in Lifshitz scalar theories2019

    • Author(s)
      Kim Keun-Young、Nishida Mitsuhiro、Nozaki Masahiro、Seo Minsik、Sugimoto Yuji、Tomiya Akio
    • Journal Title

      Journal of Statistical Mechanics: Theory and Experiment

      Volume: 2019 Issue: 9 Pages: 093104-093104

    • DOI

      10.1088/1742-5468/ab417f

    • Related Report
      2019 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Black-hole like excitation in conformal field theories.2021

    • Author(s)
      Masahiro Nozaki
    • Organizer
      YITP Workshop Strings and Fields 2021
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Operator entanglement and quantum scrambling2020

    • Author(s)
      野崎 雅弘
    • Organizer
      Strings and Fields 2020
    • Related Report
      2020 Research-status Report
    • Int'l Joint Research
  • [Presentation] Signature of quantum chaos in operator entanglement in 2d CFTs” Holography, Quantum Information and String Theory2019

    • Author(s)
      野崎 雅弘
    • Organizer
      Holography, Quantum Information and String Theory
    • Related Report
      2019 Research-status Report
    • Int'l Joint Research / Invited

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

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