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Theoretical studies of nonequilibrium open systems using nonperturbative approaches

Research Project

Project/Area Number 21K13859
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 13020:Semiconductors, optical properties of condensed matter and atomic physics-related
Research InstitutionThe University of Tokyo

Principal Investigator

Ashida Yuto  東京大学, 大学院理学系研究科(理学部), 准教授 (00845464)

Project Period (FY) 2021-04-01 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥4,680,000 (Direct Cost: ¥3,600,000、Indirect Cost: ¥1,080,000)
Fiscal Year 2023: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2022: ¥1,430,000 (Direct Cost: ¥1,100,000、Indirect Cost: ¥330,000)
Fiscal Year 2021: ¥1,820,000 (Direct Cost: ¥1,400,000、Indirect Cost: ¥420,000)
Keywords量子多体物理 / 量子光学 / 共振器 / 繰り込み群 / 開放系 / 非エルミート系 / 量子多体系 / 非平衡開放系 / 統計物理 / 機械学習
Outline of Research at the Start

本研究の目的は、外界環境と強く結合した非摂動開放系を解析するための理論手法を開発し、その応用により新奇な量子相や非平衡ダイナミクスを解明することである。近年大きな進展があった、非エルミート系に代表される「摂動領域の開放系」とは対照的に、実験的にも重要になっている「非摂動効果が本質的となる開放系」に着目して研究を進め、新たな物性/光物理学のフロンティアを拓く。

Outline of Final Research Achievements

Conventional frameworks of condensed matter physics and statistical mechanics have had tremendous success in elucidating the laws and diverse phenomena of physical systems in thermal equilibrium. Meanwhile, the understanding of non-equilibrium open systems with inflow/dissipation of energy and matter is still in its infancy. While great progress has been made in the past few years in understanding regions where the coupling to the external environment is weak and the effects of the external environment can be treated perturbatively, the fundamental theory, let alone the physical phenomena that occur in strongly coupled nonperturbative regions, has not yet been developed. In this study, we have developed a fundamental theory describing non-equilibrium open systems that strongly interact with the external environment and for which nonperturbative treatment is essentially important, and have clarified the possibility of controlling material properties using cavity confinement.

Academic Significance and Societal Importance of the Research Achievements

非平衡開放系は従来の統計物理や量子物理ではあまり考えられてこなかった新しい現象を発現する可能性を秘めた物理系で、近年世界中で盛んに研究がなされています。本研究により開放系の研究をこれまで取り扱いが困難と考えられてきた非摂動領域に展開するための端緒が得られました。特に、共振器を用いた物性制御の可能性が理論的に本研究で明らかとなりました。将来的にはこれらの成果が量子デバイスの制御やデコヒーレンスの抑制に向けた指針を与えるものと期待します。

Report

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

    (42 results)

All 2024 2023 2022 2021 Other

All Int'l Joint Research (2 results) Journal Article (16 results) (of which Int'l Joint Research: 3 results,  Peer Reviewed: 16 results,  Open Access: 9 results) Presentation (22 results) (of which Int'l Joint Research: 12 results,  Invited: 14 results) Remarks (2 results)

  • [Int'l Joint Research] ETH(スイス)

    • Related Report
      2023 Annual Research Report
  • [Int'l Joint Research] スイス連邦大学(ETH)(スイス)

    • Related Report
      2022 Research-status Report
  • [Journal Article] Role of Topology in Relaxation of One-Dimensional Stochastic Processes2024

    • Author(s)
      Sawada Taro、Sone Kazuki、Hamazaki Ryusuke、Ashida Yuto、Sagawa Takahiro
    • Journal Title

      Physical Review Letters

      Volume: 132 Issue: 4 Pages: 046602-046602

    • DOI

      10.1103/physrevlett.132.046602

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Non-Bloch band theory of generalized eigenvalue problems2024

    • Author(s)
      Yokomizo Kazuki、Yoda Taiki、Ashida Yuto
    • Journal Title

      Physical Review B

      Volume: 109 Issue: 11 Pages: 115115-115115

    • DOI

      10.1103/physrevb.109.115115

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Functional-renormalization-group approach to circuit quantum electrodynamics2023

    • Author(s)
      Yokota Takeru、Masuki Kanta、Ashida Yuto
    • Journal Title

      Physical Review A

      Volume: 107 Issue: 4 Pages: 043709-043709

    • DOI

      10.1103/physreva.107.043709

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Berry phase and topology in ultrastrongly coupled quantum light-matter systems2023

    • Author(s)
      Masuki Kanta、Ashida Yuto
    • Journal Title

      Physical Review B

      Volume: 107 Issue: 19 Pages: 195104-195104

    • DOI

      10.1103/physrevb.107.195104

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Cavity Quantum Electrodynamics with Hyperbolic van der Waals Materials2023

    • Author(s)
      Ashida Yuto、Imamoglu Atac、Demler Eugene
    • Journal Title

      Physical Review Letters

      Volume: 130 Issue: 21 Pages: 216901-216901

    • DOI

      10.1103/physrevlett.130.216901

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Non-Hermitian physics of levitated nanoparticle array2023

    • Author(s)
      Yokomizo Kazuki、Ashida Yuto
    • Journal Title

      Physical Review Research

      Volume: 5 Issue: 3 Pages: 033217-033217

    • DOI

      10.1103/physrevresearch.5.033217

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Masuki et al. Reply:2023

    • Author(s)
      Masuki Kanta、Sudo Hiroyuki、Oshikawa Masaki、Ashida Yuto
    • Journal Title

      Physical Review Letters

      Volume: 131 Issue: 19 Pages: 199702-199702

    • DOI

      10.1103/physrevlett.131.199702

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Deep Reinforcement Learning for Preparation of Thermal and Prethermal Quantum States2023

    • Author(s)
      Baba Shotaro Z.、Yoshioka Nobuyuki、Ashida Yuto、Sagawa Takahiro
    • Journal Title

      Physical Review Applied

      Volume: 19 Issue: 1 Pages: 014068-014068

    • DOI

      10.1103/physrevapplied.19.014068

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Topological synchronization of coupled nonlinear oscillators2022

    • Author(s)
      Sone Kazuki、Ashida Yuto、Sagawa Takahiro
    • Journal Title

      Physical Review Research

      Volume: 4 Issue: 2 Pages: 023211-023211

    • DOI

      10.1103/physrevresearch.4.023211

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Nonperturbative waveguide quantum electrodynamics2022

    • Author(s)
      Ashida Yuto、Yokota Takeru、Imamoglu Atac、Demler Eugene
    • Journal Title

      Physical Review Research

      Volume: 4 Issue: 2 Pages: 023194-023194

    • DOI

      10.1103/physrevresearch.4.023194

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Exceptional mode topological surface laser2022

    • Author(s)
      Sone Kazuki、Ashida Yuto、Sagawa Takahiro
    • Journal Title

      Physical Review B

      Volume: 105 Issue: 23 Pages: 235426-235426

    • DOI

      10.1103/physrevb.105.235426

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Absence versus Presence of Dissipative Quantum Phase Transition in Josephson Junctions2022

    • Author(s)
      Masuki Kanta、Sudo Hiroyuki、Oshikawa Masaki、Ashida Yuto
    • Journal Title

      Physical Review Letters

      Volume: 129 Issue: 8 Pages: 087001-087001

    • DOI

      10.1103/physrevlett.129.087001

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Accurate magnetic field imaging using nanodiamond quantum sensors enhanced by machine learning2022

    • Author(s)
      Tsukamoto Moeta, Ito Shuji, Ogawa Kensuke, Ashida Yuto, Kobayashi Kensuke
    • Journal Title

      Scientific Reports

      Volume: 12 Pages: 13942-13942

    • Related Report
      2022 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Cavity Quantum Electrodynamics at Arbitrary Light-Matter Coupling Strengths2021

    • Author(s)
      Ashida Yuto、Imamoglu Atac、Demler Eugene
    • Journal Title

      Physical Review Letters

      Volume: 126 Issue: 15 Pages: 153603-153603

    • DOI

      10.1103/physrevlett.126.153603

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Non-Hermitian physics2021

    • Author(s)
      Ashida Yuto、Gong Zongping、Ueda Masahito
    • Journal Title

      Advances in Physics

      Volume: 69 Issue: 3 Pages: 249-435

    • DOI

      10.1080/00018732.2021.1876991

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Journal Article] Higher-order efficiency bound and its application to nonlinear nanothermoelectrics2021

    • Author(s)
      Kamijima Takuya、Otsubo Shun、Ashida Yuto、Sagawa Takahiro
    • Journal Title

      Physical Review E

      Volume: 104 Issue: 4 Pages: 044115-044115

    • DOI

      10.1103/physreve.104.044115

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] 量子測定と相転移・臨界現象2024

    • Author(s)
      蘆田祐人
    • Organizer
      KEK連携研究会2024
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 強化学習とその物理への応用2023

    • Author(s)
      蘆田祐人
    • Organizer
      「学習物理学」領域会議
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] 共振器/回路量子電磁力学の多体物理2023

    • Author(s)
      蘆田祐人
    • Organizer
      非平衡固体物性の最前線
    • Related Report
      2023 Annual Research Report
    • Invited
  • [Presentation] Cavity QED control of quantum materials2023

    • Author(s)
      Y. Ashida
    • Organizer
      Periodically and quasi-periodically driven complex systems
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Hermitian and non-Hermitian topological phenomena in active matter2023

    • Author(s)
      Y. Ashida
    • Organizer
      Frontiers in nonequilibrium physics: Active matter, topology and beyond
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] System-Environment Entanglement Phase Transitions2023

    • Author(s)
      Y. Ashida
    • Organizer
      Correlation and Topology in Quantum Matter
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 共振器量子光-物質系の物理2023

    • Author(s)
      蘆田祐人
    • Organizer
      日本物理学会2023年春季大会シンポジウム
    • Related Report
      2022 Research-status Report
    • Invited
  • [Presentation] Non-Hermitian physics of levitated nanoparticle array2023

    • Author(s)
      K. Yokomizo and Y. Ashida
    • Organizer
      APS March meeting 2023
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Cavity Moire Materials: controlling correlated phases of matter with quantum light-matter couplings2023

    • Author(s)
      K. Masuki and Y. Ashida
    • Organizer
      FoPM International Symposium
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] Variational approach for Kondo problem with Quantum LightMatter interaction2023

    • Author(s)
      J. Mochida and Y. Ashida
    • Organizer
      FoPM International Symposium
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research
  • [Presentation] 浮揚ナノ粒子アレイの非エルミート物理2023

    • Author(s)
      横溝和樹, 蘆田祐人
    • Organizer
      日本物理学会2023年春季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Nonperturbative cavity/waveguide quantum electrodynamics and dissipative quantum phase transition2022

    • Author(s)
      Y. Ashida
    • Organizer
      Ultracold Atoms Japan 2022
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Nonperturbative cavity/waveguide quantum electrodynamics2022

    • Author(s)
      Y. Ashida
    • Organizer
      APPC15
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Nonperturbative renormalization group approach to dissipative quantum phase transition2022

    • Author(s)
      Y. Ashida
    • Organizer
      DDAP12
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 超強結合領域の共振器量子物質系における量子幾何2022

    • Author(s)
      増木貫太, 蘆田祐人
    • Organizer
      日本物理学会2022年次秋季大会
    • Related Report
      2022 Research-status Report
  • [Presentation] Shedding quantum light on quantum materials2022

    • Author(s)
      Y. Ashida
    • Organizer
      the 3rd International Symposium on Dynamics of Artificial Quantum Systems (DAQS2022)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Hermitian and non-Hermitian topological phenomena in active matter,2022

    • Author(s)
      Y. Ashida
    • Organizer
      APS March meeting 2022
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 例外表面モードに保護されたトポロジカルレーザー2022

    • Author(s)
      曽根和樹, 蘆田祐人, 沙川貴大
    • Organizer
      日本物理学会2022年年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] ジョセフソン接合における量子相転移の非摂動くりこみ群解析2022

    • Author(s)
      増木貫太, 數藤広之, 押川正毅, 蘆田祐人
    • Organizer
      日本物理学会2022年年次大会
    • Related Report
      2021 Research-status Report
  • [Presentation] Nonequilibrium dynamics and thermalization in open quantum many-body systems2021

    • Author(s)
      Y. Ashida
    • Organizer
      META 2021
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] バンドトポロジー由来の非線形トポロジカル同期2021

    • Author(s)
      曽根和樹, 蘆田祐人, 沙川貴大
    • Organizer
      日本物理学会2021年秋季大会
    • Related Report
      2021 Research-status Report
  • [Presentation] 差分進化を用いた最適なナノ熱機関の探索2021

    • Author(s)
      蘆田祐人
    • Organizer
      ディープラーニングと物理学オンライン
    • Related Report
      2021 Research-status Report
    • Invited
  • [Remarks] 蘆田研究室HP

    • URL

      https://park.itc.u-tokyo.ac.jp/ashida-g/home.html

    • Related Report
      2023 Annual Research Report
  • [Remarks] 東京大学蘆田研究室

    • URL

      http://park.itc.u-tokyo.ac.jp/ashida-g/home.html

    • Related Report
      2022 Research-status Report 2021 Research-status Report

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Published: 2021-04-28   Modified: 2025-01-30  

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