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Nonlinear feedforward enabling quantum computation

Author

Listed:
  • Atsushi Sakaguchi

    (The University of Tokyo
    RIKEN Center for Quantum Computing)

  • Shunya Konno

    (The University of Tokyo)

  • Fumiya Hanamura

    (The University of Tokyo)

  • Warit Asavanant

    (The University of Tokyo
    RIKEN Center for Quantum Computing)

  • Kan Takase

    (The University of Tokyo
    RIKEN Center for Quantum Computing)

  • Hisashi Ogawa

    (The University of Tokyo)

  • Petr Marek

    (Palacký University)

  • Radim Filip

    (Palacký University)

  • Jun-ichi Yoshikawa

    (The University of Tokyo
    RIKEN Center for Quantum Computing)

  • Elanor Huntington

    (Australian National University)

  • Hidehiro Yonezawa

    (University of New South Wales)

  • Akira Furusawa

    (The University of Tokyo
    RIKEN Center for Quantum Computing)

Abstract

Measurement-based quantum computation with optical time-domain multiplexing is a promising method to realize a quantum computer from the viewpoint of scalability. Fault tolerance and universality are also realizable by preparing appropriate resource quantum states and electro-optical feedforward that is altered based on measurement results. While linear feedforward has been realized and become a common experimental technique, nonlinear feedforward was unrealized until now. In this paper, we demonstrate that a fast and flexible nonlinear feedforward realizes the essential measurement required for fault-tolerant and universal quantum computation. Using non-Gaussian ancillary states, we observed 10% reduction of the measurement excess noise relative to classical vacuum ancilla.

Suggested Citation

  • Atsushi Sakaguchi & Shunya Konno & Fumiya Hanamura & Warit Asavanant & Kan Takase & Hisashi Ogawa & Petr Marek & Radim Filip & Jun-ichi Yoshikawa & Elanor Huntington & Hidehiro Yonezawa & Akira Furusa, 2023. "Nonlinear feedforward enabling quantum computation," Nature Communications, Nature, vol. 14(1), pages 1-8, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-39195-w
    DOI: 10.1038/s41467-023-39195-w
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    References listed on IDEAS

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    1. Y. Nakamura & Yu. A. Pashkin & J. S. Tsai, 1999. "Coherent control of macroscopic quantum states in a single-Cooper-pair box," Nature, Nature, vol. 398(6730), pages 786-788, April.
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