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 and Akira Furusawa ()
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Atsushi Sakaguchi: The University of Tokyo
Shunya Konno: The University of Tokyo
Fumiya Hanamura: The University of Tokyo
Warit Asavanant: The University of Tokyo
Kan Takase: The University of Tokyo
Hisashi Ogawa: The University of Tokyo
Petr Marek: Palacký University
Radim Filip: Palacký University
Jun-ichi Yoshikawa: The University of Tokyo
Elanor Huntington: Australian National University
Hidehiro Yonezawa: University of New South Wales
Akira Furusawa: The University of Tokyo

Nature Communications, 2023, vol. 14, issue 1, 1-8

Abstract: 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.

Date: 2023
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DOI: 10.1038/s41467-023-39195-w

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