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Studies of split-step quantum walks by Jost solutions

Research Project

Project/Area Number 21K13846
Research Category

Grant-in-Aid for Early-Career Scientists

Allocation TypeMulti-year Fund
Review Section Basic Section 12040:Applied mathematics and statistics-related
Research InstitutionHachinohe National College of Technology

Principal Investigator

Wada Kazuyuki  八戸工業高等専門学校, その他部局等, 助教 (80780197)

Project Period (FY) 2021-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥1,040,000 (Direct Cost: ¥800,000、Indirect Cost: ¥240,000)
Fiscal Year 2022: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Fiscal Year 2021: ¥520,000 (Direct Cost: ¥400,000、Indirect Cost: ¥120,000)
Keywords量子ウォーク / ヨスト解 / 弱収束定理 / Witten指数 / ユニタリ同値類 / スプリットステップ量子ウォーク / 分散関係 / フレドホルム指数 / 散乱理論
Outline of Research at the Start

量子ウォークはランダムウォークの量子版として導入された数理モデルである.その中でスプリットステップ量子ウォークはトポロジカル相と深く関連するモデルである.スプリットステップ量子ウォークの弱極限分布を明らかにすることは重要な課題となっている.長距離型条件まで含めた弱極限分布の導出には波動作用素だけでは不十分である.そこでヨスト解に注目し,その解を用いて弱極限分布の導出を行う.

Outline of Final Research Achievements

The goal of this research is to clarify the weak limit distribution of split-step quantum walks by the application of Jost solutions (Generalized eigenfunctions). We established the analysis of dispersion relation and construction of Jost solutions of of split-step quantum walks. After that, we construct the modified wave operators. The rest of work is to complete the proof of weak limit theorems and to announce our results via research paper. Related to this research, we established the Witten index formula of split-step quantum walks.

Academic Significance and Societal Importance of the Research Achievements

量子ウォークは近年注目されている量子コンピューターや量子アルゴリズムを始めとする諸分野への応用が期待されているモデルである.その中でスプリットステップ量子ウォークはトポロジカル相と深い関連がある.本研究は長時間挙動に関係するものであり,その側面についてスプリットステップ量子ウォークが持つ性質を明らかにする事が出来た事は,諸分野への更なる応用が期待される事,分野横断的な発展が期待される点で,学術的・社会的な意義がある.

Report

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

    (9 results)

All 2023 2022 2021

All Journal Article (3 results) (of which Peer Reviewed: 3 results,  Open Access: 1 results) Presentation (6 results) (of which Int'l Joint Research: 2 results,  Invited: 4 results)

  • [Journal Article] The Witten index for one-dimensional split-step quantum walks under the non-Fredholm condition2023

    • Author(s)
      Matsuzawa Yasumichi、Suzuki Akito、Tanaka Yohei、Teranishi Noriaki、Wada Kazuyuki
    • Journal Title

      Reviews in Mathematical Physics

      Volume: TBA Issue: 06

    • DOI

      10.1142/s0129055x23500101

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Absence of singular continuous spectra and embedded eigenvalues for one-dimensional quantum walks with general long-range coins2022

    • Author(s)
      Maeda Masaya、Suzuki Akito、Wada Kazuyuki
    • Journal Title

      Reviews in Mathematical Physics

      Volume: - Issue: 05 Pages: 2250016-2250016

    • DOI

      10.1142/s0129055x22500167

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access
  • [Journal Article] Unitary equivalence classes of split-step quantum walks2021

    • Author(s)
      Narimatsu Akihiro、Ohno Hiromichi、Wada Kazuyuki
    • Journal Title

      Quantum Information Processing

      Volume: 20 Issue: 11 Pages: 1-23

    • DOI

      10.1007/s11128-021-03323-6

    • Related Report
      2021 Research-status Report
    • Peer Reviewed
  • [Presentation] The Witten index for split-step quantum walks in 1d2023

    • Author(s)
      Kazuyuki Wada
    • Organizer
      Japan-Netherlands Joint Seminar: Index Theory and Operator Algebras in Topological Physics
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 1次元スプリットステップ量子ウォークのWitten指数2022

    • Author(s)
      和田 和幸
    • 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
      2022 Annual Research Report
    • Invited
  • [Presentation] Spectal theory and weak limit theorems for quantum walks in 1d2022

    • Author(s)
      Kazuyuki Wada
    • Organizer
      RIMS(Conference) Rigorous Statistical Mechanics and Related Topics
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] 非フレドホルムスプリットステップ量子ウォークのウィッテン指数2021

    • Author(s)
      和田 和幸
    • Organizer
      日本数学会2021年度秋季総合分科会 応用数学分科会
    • Related Report
      2021 Research-status Report
  • [Presentation] Witten index for 1-dimensional split-step quantum walks under non-Fredholm condition2021

    • Author(s)
      Kazuyuki Wada
    • Organizer
      RIMS共同研究「スペクトル・散乱理論とその周辺」
    • Related Report
      2021 Research-status Report
    • Invited
  • [Presentation] 1次元スプリットステップ量子ウォークのWitten指数2021

    • Author(s)
      和田 和幸
    • Organizer
      2021年度応用数学合同研究集会 離散系
    • Related Report
      2021 Research-status Report

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Published: 2021-04-28   Modified: 2024-01-30  

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