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Algebraic combinatorics and its ties with other areas

Research Project

Project/Area Number 20K03551
Research Category

Grant-in-Aid for Scientific Research (C)

Allocation TypeMulti-year Fund
Section一般
Review Section Basic Section 11010:Algebra-related
Research InstitutionTohoku University

Principal Investigator

Tanaka Hajime  東北大学, 情報科学研究科, 准教授 (50466546)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥4,290,000 (Direct Cost: ¥3,300,000、Indirect Cost: ¥990,000)
Fiscal Year 2022: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2021: ¥1,300,000 (Direct Cost: ¥1,000,000、Indirect Cost: ¥300,000)
Fiscal Year 2020: ¥1,690,000 (Direct Cost: ¥1,300,000、Indirect Cost: ¥390,000)
Keywords距離正則グラフ / アソシエーションスキーム / Terwilliger 代数 / グラフのスペクトル / 量子ウォーク / 量子中心極限定理 / 量子探索アルゴリズム / 量子確率論 / 強正則グラフ / 代数的組合せ論 / 半正定値計画法
Outline of Research at the Start

有限単純グラフの各頂点に付随する非可換半単純C-代数であるTerwilliger代数の、符号・デザイン理論や極値集合論等への応用、及び直交多項式の理論や量子群の表現論、量子確率論・量子情報理論を含む他分野との結び付きが近年ますます深化しつつある。本研究計画は、Terwilliger代数や関連した行列C-代数の表現論の整備を押し進めてこれら諸分野との連携をさらに一層追求するものであり、工学等に幅広い応用を持つグラフのスペクトル理論の「非可換化」の試みと位置付けられる。

Outline of Final Research Achievements

I explored applications of the representation theory of noncommutative semisimple matrix algebras associated with a graph and obtained results, such as vertex search algorithms on graphs based on quantum walks and quantum central limit theorems on graphs. Besides, I worked on research on graphs from the viewpoint of quantum probability theory and partial proof of a conjecture about the duality of association schemes, etc. At around the end of the period of the research plan, I was also involved with multiple projects on certain quantum algorithms and graphic rendering, etc., and I plan to publicize the outcomes as soon as they are ready.

Academic Significance and Societal Importance of the Research Achievements

代数的グラフ理論或いはグラフのスペクトル理論はそもそも情報理論等の工学的分野とも直接関わって発展してきたが、本研究計画では量子情報理論や量子確率論、さらには工学の分野 (グラフィックレンダリング) についても成果を上げることができ、数学の理論・応用の両側面について十分な貢献を行うことができたものと考える。特に、量子情報理論の研究は2018年頃より構想を進めてきたものであり、本研究計画期間中に予定通り実施できたのは大きな進展である。

Report

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

    (20 results)

All 2023 2022 2021 2020 Other

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

  • [Int'l Joint Research] LNCC(ブラジル)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] LNCC(ブラジル)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] 安徽大学/安徽建築大学(中国)

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] 国立中央大学(その他の国・地域 (台湾))

    • Related Report
      2021 Research-status Report
  • [Int'l Joint Research] K. N. Toosi University of Technology(イラン)

    • Related Report
      2020 Research-status Report
  • [Int'l Joint Research] 安徽大学/安徽建築大学(中国)

    • Related Report
      2020 Research-status Report
  • [Journal Article] Characterizing graphs with fully positive semidefinite Q-matrices2023

    • Author(s)
      Hajime Tanaka
    • Journal Title

      Linear Algebra and its Applications

      Volume: 671 Pages: 59-66

    • DOI

      10.1016/j.laa.2023.04.018

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed
  • [Journal Article] Spatial search on Johnson graphs by discrete-time quantum walk2022

    • Author(s)
      Hajime Tanaka, Mohamed Sabri, Renato Portugal
    • Journal Title

      Journal of Physics A: Mathematical and Theoretical

      Volume: 55 Issue: 25 Pages: 255304-255304

    • DOI

      10.1088/1751-8121/ac6f30

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] A duality of scaffolds for translation association schemes2022

    • Author(s)
      Xiaoye Liang, Ying-Ying Tan, Hajime Tanaka, Tao Wang
    • Journal Title

      Linear Algebra and its Applications

      Volume: 638 Pages: 110-124

    • DOI

      10.1016/j.laa.2021.12.018

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Spatial search on Johnson graphs by continuous-time quantum walk2022

    • Author(s)
      Hajime Tanaka, Mohamed Sabri, Renato Portugal
    • Journal Title

      Quantum Information Processing

      Volume: 21 Issue: 2 Pages: 74-74

    • DOI

      10.1007/s11128-022-03417-9

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Scaling limits for the Gibbs states on distance-regular graphs with classical parameters2021

    • Author(s)
      Masoumeh Koohestani, Nobuaki Obata, Hajime Tanaka
    • Journal Title

      Symmetry, Integrability and Geometry: Methods and Applications

      Volume: 17 Pages: 104-104

    • DOI

      10.3842/sigma.2021.104

    • NAID

      40022686657

    • Related Report
      2021 Research-status Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] The Terwilliger algebra of the twisted Grassmann graph: the thin case2020

    • Author(s)
      Hajime Tanaka and Tao Wang
    • Journal Title

      The Electronic Journal of Combinatorics

      Volume: 27 Issue: 4

    • DOI

      10.37236/9873

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] Scaling limits for the Gibbs states on distance-regular graphs with classical parameters2022

    • Author(s)
      Hajime Tanaka
    • Organizer
      The 19th Workshop: Noncommutative Probability, Noncommutative Harmonic Analysis and Related Topics, with Applications
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Characterizing graphs with fully positive semidefinite Q-matrices2022

    • Author(s)
      田中 太初
    • Organizer
      RIMS共同研究 (公開型)「有限群論, 代数的組合せ論, 頂点代数の研究」
    • Related Report
      2022 Annual Research Report
  • [Presentation] Spatial search on Johnson graphs by discrete-time quantum walk2022

    • Author(s)
      Hajime Tanaka
    • Organizer
      Workshop on Algebraic Combinatorics
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] 量子ウォークに基づく Johnson グラフ上の探索アルゴリズム2022

    • Author(s)
      田中 太初
    • Organizer
      代数学の広がり
    • Related Report
      2021 Research-status Report
  • [Presentation] Spatial search on Johnson graphs by continuous-time quantum walk2021

    • Author(s)
      Hajime Tanaka
    • Organizer
      Workshop on Algebraic Graph Theory and Quantum Information
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research / Invited
  • [Presentation] Scaling limits for the Gibbs states on distance-regular graphs with classical parameters2020

    • Author(s)
      田中 太初
    • Organizer
      RIMS 共同研究 (公開型) 「有限群論, 代数的組合せ論, 頂点代数の研究」
    • Related Report
      2020 Research-status Report
  • [Remarks] 個人ウェブサイト

    • URL

      https://hajimetanaka.org/

    • Related Report
      2022 Annual Research Report 2021 Research-status Report
  • [Remarks] 個人ウェブサイト

    • URL

      http://www.math.is.tohoku.ac.jp/~htanaka/

    • Related Report
      2020 Research-status Report

URL: 

Published: 2020-04-28   Modified: 2024-01-30  

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