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Demonstration of coherent bifurcation toward realization of optical quantum computing

Research Project

Project/Area Number 22K20351
Research Category

Grant-in-Aid for Research Activity Start-up

Allocation TypeMulti-year Fund
Review Section 0202:Condensed matter physics, plasma science, nuclear engineering, earth resources engineering, energy engineering, and related fields
Research InstitutionThe University of Tokyo

Principal Investigator

Takase Kan  東京大学, 大学院工学系研究科(工学部), 助教 (70963990)

Project Period (FY) 2022-08-31 – 2024-03-31
Project Status Completed (Fiscal Year 2023)
Budget Amount *help
¥2,860,000 (Direct Cost: ¥2,200,000、Indirect Cost: ¥660,000)
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)
Keywords非ガウス型状態 / 伝令付き状態生成 / 量子コンピュータ / 光量子情報処理 / 量子光学
Outline of Research at the Start

量子コンピュータは次世代の情報技術として注目を集めている。光を使った量子コンピュータは量子計算の大規模化が容易な点で有望だが、その実用化にはGottesman-Kitaev-Preskill(GKP)量子ビットと呼ばれる特殊な光量子状態が必要である。これまで光GKP量子ビットを自在に生成する手法は知られていなかったが、可干渉分岐という量子操作で任意のGKP量子ビットが生成できると近年明らかになった。本研究は可干渉分岐を実証し、GKP量子ビット生成に向けた第一歩を達成することを目指す。

Outline of Final Research Achievements

When the wave function of quantum light is given by a Gaussian function, coherent bifurcation is used to split it into a sum of displaced Gaussian functions. In the original proposal, coherent bifurcation required an operation called a universal squeezer, which was difficult to implement experimentally. Therefore, the researchers simplified the coherent bifurcation by using Bloch Messiah decomposition. This simplified coherent bifurcation was demonstrated by photon number measurement up to three photons.

Academic Significance and Societal Importance of the Research Achievements

本研究は、申請者が提案しているGKP量子ビットの生成手法の最も基礎となる技術である。本研究をさらに発展させることで光進行波中にGKP量子ビットを生成する難易度が大幅に低下し、光量子コンピュータ上で量子誤り訂正を実行可能になる。光量子コンピュータは優れたスケーラビリティや常温常圧での稼働、高いクロック周波数などからいち早い実用化が期待されており、本研究は量子技術の社会実証を推進する役割を果たしている。

Report

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

    (4 results)

All 2024 2023 2022 Other

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

  • [Int'l Joint Research] Johannes Gutenberg University Mainz(ドイツ)

    • Related Report
      2022 Research-status Report
  • [Journal Article] Gottesman-Kitaev-Preskill qubit synthesizer for propagating light2023

    • Author(s)
      Takase Kan、Fukui Kosuke、Kawasaki Akito、Asavanant Warit、Endo Mamoru、Yoshikawa Jun-ichi、van Loock Peter、Furusawa Akira
    • Journal Title

      npj Quantum Information

      Volume: 9 Issue: 1 Pages: 98-98

    • DOI

      10.1038/s41534-023-00772-y

    • Related Report
      2023 Annual Research Report
    • Peer Reviewed / Open Access / Int'l Joint Research
  • [Presentation] Adaptive generation of flying logical qubits2024

    • Author(s)
      Kan Takase, Fumiya Hanamura, Hironari Nagayoshi, Akito Kawasaki, Warit Asavanant, Mamoru Endo, Akira Furusawa
    • Organizer
      CLEO 2024
    • Related Report
      2023 Annual Research Report
    • Int'l Joint Research
  • [Presentation] Arbitrary Gottesman-Kitaev-Preskill state synthesizer2022

    • Author(s)
      Kan Takase
    • Organizer
      Frontiers in Optics
    • Related Report
      2022 Research-status Report
    • Int'l Joint Research

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Published: 2022-09-01   Modified: 2025-01-30  

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