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Quantum probability and asymptotic analysis of large finite systems

Research Project

Project/Area Number 19H01789
Research Category

Grant-in-Aid for Scientific Research (B)

Allocation TypeSingle-year Grants
Section一般
Review Section Basic Section 12010:Basic analysis-related
Research InstitutionTohoku University

Principal Investigator

Obata Nobuaki  東北大学, データ駆動科学・AI教育研究センター, 特任教授 (10169360)

Co-Investigator(Kenkyū-buntansha) 洞 彰人  北海道大学, 理学研究院, 教授 (10212200)
田中 太初  東北大学, 情報科学研究科, 准教授 (50466546)
荒木 由布子  東北大学, 情報科学研究科, 教授 (80403913)
Project Period (FY) 2019-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥11,700,000 (Direct Cost: ¥9,000,000、Indirect Cost: ¥2,700,000)
Fiscal Year 2022: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Fiscal Year 2021: ¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
Fiscal Year 2020: ¥2,600,000 (Direct Cost: ¥2,000,000、Indirect Cost: ¥600,000)
Fiscal Year 2019: ¥3,120,000 (Direct Cost: ¥2,400,000、Indirect Cost: ¥720,000)
Keywords量子確率論 / スペクトル解析 / 漸近的組合せ論 / 代数的組合せ論 / 直交多項式 / ネットワーク数理 / グラフスペクトル / 量子ホワイトノイズ
Outline of Research at the Start

統計性の源泉を非可換代数とその表現に求める手法として、量子分解は量子確率論の基本的な概念であり、理論と応用の両面からその多変数化が重要な課題となっている。本研究では、代数的組合せ論で扱われる有限系のスペクトル解析、および付随する巨大有限系の漸近解析に応用するという観点から、多変数の確率分布を扱う理論と多変数化された量子分解法を構築することを目的として、次の4課題を扱う。
(1)成長するグラフの同時スペクトル分布と付随する多変数直交多項式の決定
(2)アソシエーションスキームに付随した量子分解法の多変数化
(3)多変数直交多項式を特徴づける量子成分の非可換構造の抽出
(4)量子ホワイトノイズ解析の集大成

Outline of Final Research Achievements

The quantum decomposition is a fundamental concept in quantum probability theory, serving as a key to attributing the source of statistical properties to noncommutative algebra and its representations. In this study, as a starting point for the multivariable extension of quantum decomposition, we obtained concrete examples of bivariate spectral distributions and associated orthogonal polynomials from pairs of growing graphs. For the extended Jacobi matrices defined by multivariable orthogonal polynomial systems, we introduced the concept of a deficiency index, achieving the first results in evaluating the support of the spectral measure. Moreover, we reproduced classical theory by classifying the family of Meixner distributions based on the noncommutativity of quantum components. As an invariant of graphs, we introduced the quadratic embedding constant (QEC) using distance matrices, accumulated concrete calculation examples, and began constructing a classification theory for graphs.

Academic Significance and Societal Importance of the Research Achievements

量子分解は、量子確率と古典確率を関連付けるための基礎概念として、本研究代表者と洞(分担者)によって定式化された。それは、グラフのスペクトル解析に量子確率論の手法を導入する動機付けとなり、直交多項式を量子確率論の枠組みで議論するきっかけを与えたため、これまでに一定の評価を得ている。本研究では、有限系のスペクトル解析を念頭に、多変数の確率分布を扱う理論、特に、量子分解の多変数化を軸とした新理論を拓くという点で独自性が高い。さらに、漸近的スペクトル解析は、Vershik の漸近的組合せ論の一翼を担い、確率論・量子論・表現論・組合せ論・関数解析などが出会う境界領域的色彩の強い研究課題である。

Report

(5 results)
  • 2023 Final Research Report ( PDF )
  • 2022 Annual Research Report
  • 2021 Annual Research Report
  • 2020 Annual Research Report
  • 2019 Annual Research Report
  • Research Products

    (33 results)

All 2023 2022 2021 2020 2019 Other

All Int'l Joint Research (15 results) Journal Article (8 results) (of which Int'l Joint Research: 6 results,  Peer Reviewed: 8 results,  Open Access: 6 results) Presentation (10 results) (of which Int'l Joint Research: 10 results,  Invited: 7 results)

  • [Int'l Joint Research] Ohio State University(米国)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Wroclaw University(ポーランド)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] Institute Technology Bandung(インドネシア)

    • Related Report
      2022 Annual Research Report
  • [Int'l Joint Research] University of Connecticut/Ohio State University(米国)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Wroclaw University(ポーランド)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Isfahan University of Technology(イラン)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Institute Technology Bandung(インドネシア)

    • Related Report
      2021 Annual Research Report
  • [Int'l Joint Research] Ohio State University/University of Connecticut(米国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Hankyong national University/Chungbuk National University(韓国)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Wroclaw University(ポーランド)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Bandung Institute of Technology(インドネシア)

    • Related Report
      2020 Annual Research Report
  • [Int'l Joint Research] Ohio State University(米国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Hankyong National University/Chungbuk National University(韓国)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Wroclaw University(ポーランド)

    • Related Report
      2019 Annual Research Report
  • [Int'l Joint Research] Politecnico di Milano(イタリア)

    • Related Report
      2019 Annual Research Report
  • [Journal Article] Primary Non-QE Graphs on Six Vertices2023

    • Author(s)
      Obata Nobuaki
    • Journal Title

      Interdisciplinary Information Sciences

      Volume: 29 Issue: 2 Pages: 141-156

    • DOI

      10.4036/iis.2023.R.01

    • ISSN
      1340-9050, 1347-6157
    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Complete multipartite graphs of non-QE class2023

    • Author(s)
      Obata Nobuaki
    • Journal Title

      Electronic Journal of Graph Theory and Applications

      Volume: 11 Issue: 2 Pages: 511-527

    • DOI

      10.5614/ejgta.2023.11.2.14

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access
  • [Journal Article] Quadratic embedding constants of graph joins2022

    • Author(s)
      Lou Zhenzhen, Obata Nobuaki, Huang Qiongxiang
    • Journal Title

      Graphs and Combinatorics

      Volume: 38 Issue: 5

    • DOI

      10.1007/s00373-022-02569-w

    • Related Report
      2022 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Determining finite connected graphs along the quadratic embedding constants of paths2021

    • Author(s)
      Baskoro Edy Tri, Obata Nobuaki
    • Journal Title

      Electronic Journal of Graph Theory and Applications

      Volume: 9 Issue: 2 Pages: 545-566

    • DOI

      10.5614/ejgta.2021.9.2.23

    • Related Report
      2021 Annual Research Report
    • Peer Reviewed / Open Access / 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 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] On quadratic embedding constants of star product graphs2020

    • Author(s)
      Wojciech Mlotkowski and Nobuaki Obata
    • Journal Title

      Hokkaido Mathematical Journal

      Volume: 49 Pages: 129-163

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Journal Article] Asymptotic joint spectra of Cartesian powers of strongly regular graphs and bivariate Charlier-Hermite polynomials2020

    • Author(s)
      John Vincent S. Morales, Nobuaki Obata, and Hajime Tanaka
    • Journal Title

      Colloquium Mathematicum

      Volume: 162 Issue: 1 Pages: 1-22

    • DOI

      10.4064/cm7724-7-2019

    • Related Report
      2020 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Journal Article] Multivariate orthogonal polynomials: Quantum decomposition, deficiency rank and support of measure2020

    • Author(s)
      Ameur Dhahri, Nobuaki Obata, Hyun Jae Yoo
    • Journal Title

      Journal of Mathematical Analysis and Applications

      Volume: 485 Issue: 1 Pages: 123775-123775

    • DOI

      10.1016/j.jmaa.2019.123775

    • Related Report
      2019 Annual Research Report
    • Peer Reviewed / Int'l Joint Research
  • [Presentation] Quadratic embedding of graphs and positivity of their Q-matrices2023

    • Author(s)
      Obata Nobuaki
    • Organizer
      Workshop on Quantum Probability and Infinite Dimensional Analysis in honor of Professor Hui-Hsiung Kuo
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Positivity of Q-matrices and quadratic embedding constants of graphs2023

    • Author(s)
      Obata Nobuaki
    • Organizer
      10th International Congress on Industrial and Applied Mathematics (ICIAM2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] On quadratic embedding constants of graphs2023

    • Author(s)
      Obata Nobuaki
    • Organizer
      The 25th Indonesia-Japan Conference on Discrete and Computational Geometry, Graphs and Games (IJCDCG3 2023)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] A quantitative approach to quadratic embedding constants of graphs2023

    • Author(s)
      Obata Nobuaki
    • Organizer
      The 7th Tunisian-Japanese Conference: Geometric and Harmonic Analysis on Homogeneous Spaces and Applications
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Some recent results on quadratic embedding constants of graphs2022

    • Author(s)
      Obata Nobuaki
    • Organizer
      International Conference on Graph Theory and Information Security V2022
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Positive definite Q-matrices and primary non-QE graphs2022

    • Author(s)
      Obata Nobuaki
    • Organizer
      19th Workshop: Noncommutative Probability, Noncommutative Harmonic Analysis and Related Topics, with Applications
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Asymptotic spectral distributions for growing distance-regular graphs2022

    • Author(s)
      Obata Nobuaki
    • Organizer
      AMS Spring Eastern Virtual Sectional Meeting: Special Session on Quantum Probability, Orthogonal Polynomials, and Special Functions
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Quadratic embedding constants of graphs2021

    • Author(s)
      Obata Nobuaki
    • Organizer
      International Conference on Mathematics, Geometry, Statistics, and Computation 2021 (Online)
    • Related Report
      2021 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Quadratic embedding constants of graphs2019

    • Author(s)
      Nobuaki Obata
    • Organizer
      Non-Commutative Probability and Related Fields, Ochanomizu University
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited
  • [Presentation] Spectral analysis of growing graphs: A quantum probability point of view2019

    • Author(s)
      Nobuaki Obata
    • Organizer
      Mini-Course Lectures, International Conference and PhD-Master Summer School on Groups and Graphs, Designs and Dynamics (G2D2), Three Gorges Mathematical Research Center, China
    • Related Report
      2019 Annual Research Report
    • Int'l Joint Research / Invited

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Published: 2019-04-18   Modified: 2025-01-30  

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