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Broadband generation and tomography of non-Gaussian states for ultra-fast optical quantum processors

Author

Listed:
  • Akito Kawasaki

    (The University of Tokyo)

  • Ryuhoh Ide

    (The University of Tokyo)

  • Hector Brunel

    (The University of Tokyo
    Ecole Normale Supérieure)

  • Takumi Suzuki

    (The University of Tokyo)

  • Rajveer Nehra

    (The University of Tokyo
    University of Massachusetts Amherst
    University of Massachusetts Amherst)

  • Katsuki Nakashima

    (The University of Tokyo)

  • Takahiro Kashiwazaki

    (NTT Corporation)

  • Asuka Inoue

    (NTT Corporation)

  • Takeshi Umeki

    (NTT Corporation)

  • Fumihiro China

    (National Institute of Information and Communications Technology)

  • Masahiro Yabuno

    (National Institute of Information and Communications Technology)

  • Shigehito Miki

    (National Institute of Information and Communications Technology)

  • Hirotaka Terai

    (National Institute of Information and Communications Technology)

  • Taichi Yamashima

    (The University of Tokyo)

  • Atsushi Sakaguchi

    (RIKEN Center for Quantum Computing)

  • Kan Takase

    (The University of Tokyo
    RIKEN Center for Quantum Computing)

  • Mamoru Endo

    (The University of Tokyo
    RIKEN Center for Quantum Computing)

  • Warit Asavanant

    (The University of Tokyo
    RIKEN Center for Quantum Computing)

  • Akira Furusawa

    (The University of Tokyo
    RIKEN Center for Quantum Computing)

Abstract

Quantum information processors benefit from high clock frequencies to fully harness quantum advantages before they are lost to decoherence. All-optical systems offer unique benefits due to their inherent 100-THz carrier frequency, enabling the development of THz-clock frequency processors. However, the bandwidth of quantum light sources and measurement devices has been limited to the MHz range, with nonclassical state generation rates in the kHz range. In this study, we demonstrated broadband generation and quantum tomography of non-Gaussian states using an optical parametric amplifier (OPA) as a squeezed light source and an optical phase-sensitive amplifier (PSA). Our system includes a 6-THz squeezed-light source, a 6-THz PSA, and a 66-GHz homodyne detector. We successfully generated non-Gaussian states at a 0.9 MHz rate with sub-nanosecond wave packets using a continuous-wave laser. The performance is currently limited by the jitter of superconducting detectors, restricting the usable bandwidth to 1 GHz. Our technique extends the bandwidth to GHz, potentially increasing non-Gaussian state generation rates for practical optical quantum processors using OPAs.

Suggested Citation

  • Akito Kawasaki & Ryuhoh Ide & Hector Brunel & Takumi Suzuki & Rajveer Nehra & Katsuki Nakashima & Takahiro Kashiwazaki & Asuka Inoue & Takeshi Umeki & Fumihiro China & Masahiro Yabuno & Shigehito Miki, 2024. "Broadband generation and tomography of non-Gaussian states for ultra-fast optical quantum processors," Nature Communications, Nature, vol. 15(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-53408-w
    DOI: 10.1038/s41467-024-53408-w
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    References listed on IDEAS

    as
    1. Yaakov Shaked & Yoad Michael & Rafi Z. Vered & Leon Bello & Michael Rosenbluh & Avi Pe’er, 2018. "Lifting the bandwidth limit of optical homodyne measurement with broadband parametric amplification," Nature Communications, Nature, vol. 9(1), pages 1-12, December.
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