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Innovation by Strongly Correlated Photonic System

Research Project

Project/Area Number 18K19958
Research Category

Fund for the Promotion of Joint International Research (Home-Returning Researcher Development Research)

Allocation TypeMulti-year Fund
Review Section Science and Engineering
Research InstitutionHitachi,Ltd. (Research&Development Group)

Principal Investigator

Shinichi Saito  株式会社日立製作所(研究開発グループ), 基礎研究センタ, 主管研究員・部長 (80308212)

Project Period (FY) 2020-04-01 – 2023-03-31
Project Status Completed (Fiscal Year 2022)
Budget Amount *help
¥61,880,000 (Direct Cost: ¥47,600,000、Indirect Cost: ¥14,280,000)
Keywordsフォトニクス / 量子技術 / 角運動量 / 光渦 / 偏光 / エンタングルメント / 強相関 / コヒーレント光 / 光量子 / スピン / 強相関系 / リー代数 / シリコンフォトニクス / Si Photonics / 量子光学
Outline of Final Research Achievements

In this project, I was aiming to realise photonic strongly correlated system by manipulating angular momentum of coherent photons both theoretically and experimentally. I have shown that the Stokes parameters are expectation values of coherent photons. I have also shown the validity of commutation relationship for orbital angular momentum of photons. In a waveuide, I have theoretically proven that we can split spin and orbital angular momentum of photons.
I have proposed Poincare rotator, which can realise an arbitrary superposition state of SU(2) in spin and orbital angular momentum. As a demonstration, I have realised photonic C60 and the coastline of the earth, drawn on Poincare sphere. I have also realised macroscopic entangled state of spin and orbital angular momentum. I have also experimentally obtained the images of singlet and triplet states after the Bell projection. It was beyond my expectation that the angular momentum of photons are related to Lie group.

Academic Significance and Societal Importance of the Research Achievements

量子力学の創生に深く関わったアインシュタインは,光子とは何かを理解できなかったと述べています。本研究では、光の角運動量とは何かという基礎的な問題に対して,最先端の実験技術と場の量子論という理論的な枠組みで取り組みました.その結果,光の角運動量は量子的な性質を持っており,その状態を制御する事で様々な新しい応用が可能であることが分かりました.本研究に基づく偏光制御技術を用いると,現在の通信量を100倍程度増大できる可能性がある事が実験的に明らかになりました.また,光の角運動量を量子ビットとして動作させる事にも成功しました。今後,新しい国産光量子コンピュータや高感度の量子センサ応用が期待されます.

Report

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

    (18 results)

All 2023 2022 2021 2020

All Journal Article (12 results) (of which Open Access: 12 results,  Peer Reviewed: 1 results) Presentation (2 results) (of which Int'l Joint Research: 2 results) Patent(Industrial Property Rights) (4 results) (of which Overseas: 2 results)

  • [Journal Article] Spin of Photons: Nature of Polarisation2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Quantum Commutation Relationship for Photonic Orbital Angular Momentum2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Spin and Orbital Angular Momentum of Coherent Photons in a Waveguide2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Dirac Equation for Photons: Origin of Polarisation Shinichi Saito2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Special Theory of Relativity for a Graded Index Fibre2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] SU(2) Symmetry of Coherent Photons and Application to Poincare Rotator2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Macroscopic Single-Qubit Operation for Coherent Photons2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Topological Polarisation States2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Macroscopic Singlet, Triplet, and Colour-Charged States of Coherent Photons2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Photonic Quantum Chromo-Dynamics2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Representation Theory and Topology of Coherent Photons with Angular Momentum2023

    • Author(s)
      Shinichi Saito
    • Journal Title

      ArXiv

      Volume: Optics

    • Related Report
      2022 Annual Research Report
    • Open Access
  • [Journal Article] Poincaré Rotator for Vortexed Photons2021

    • Author(s)
      Shinichi Saito
    • Journal Title

      Frontiers in Physics

      Volume: 9 Pages: 646228-646228

    • DOI

      10.3389/fphy.2021.646228

    • Related Report
      2020 Research-status Report
    • Peer Reviewed / Open Access
  • [Presentation] SU(4) States of Coherent Photons and Symmetry-Breaking: A Quantum-Classical Crossover2023

    • Author(s)
      Shinichi Saito
    • Organizer
      Micro Optics Conference (MOC)
    • Related Report
      2022 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Conservation law of spin & orbital angular momentum for a vortex generated by a silicon photonic gear2021

    • Author(s)
      S. Saito
    • Organizer
      Micro-Optics-Conference (MOC)
    • Related Report
      2021 Research-status Report
    • Int'l Joint Research
  • [Patent(Industrial Property Rights)] LASER OSCILLATOR2023

    • Inventor(s)
      斎藤慎一
    • Industrial Property Rights Holder
      (株)日立製作所
    • Industrial Property Rights Type
      特許
    • Filing Date
      2023
    • Related Report
      2022 Annual Research Report
    • Overseas
  • [Patent(Industrial Property Rights)] OPTICAL MODULATOR, OPTICAL RECEIVER, CONVERSION DEVICE, SPIN ORBITAL DIRECT PRODUCT STATE GENERATION DEVICE, AND QUANTUM COMPUTER2022

    • Inventor(s)
      斎藤慎一
    • Industrial Property Rights Holder
      (株)日立製作所
    • Industrial Property Rights Type
      特許
    • Filing Date
      2022
    • Related Report
      2022 Annual Research Report
    • Overseas
  • [Patent(Industrial Property Rights)] レーザ発振器2021

    • Inventor(s)
      斎藤慎一
    • Industrial Property Rights Holder
      (株)日立製作所
    • Industrial Property Rights Type
      特許
    • Filing Date
      2021
    • Related Report
      2021 Research-status Report
  • [Patent(Industrial Property Rights)] 光変調器、光受信器、変換装置、スピン軌道直積状態生成装置及び量子コンピュータ2020

    • Inventor(s)
      斎藤慎一
    • Industrial Property Rights Holder
      株式会社日立製作所
    • Industrial Property Rights Type
      特許
    • Filing Date
      2020
    • Related Report
      2020 Research-status Report

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Published: 2019-03-19   Modified: 2024-01-30  

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