Nature Communications (Jul 2023)

Nonlinear feedforward enabling quantum computation

  • Atsushi Sakaguchi,
  • Shunya Konno,
  • Fumiya Hanamura,
  • Warit Asavanant,
  • Kan Takase,
  • Hisashi Ogawa,
  • Petr Marek,
  • Radim Filip,
  • Jun-ichi Yoshikawa,
  • Elanor Huntington,
  • Hidehiro Yonezawa,
  • Akira Furusawa

DOI
https://doi.org/10.1038/s41467-023-39195-w
Journal volume & issue
Vol. 14, no. 1
pp. 1 – 8

Abstract

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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.