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

Akito Kawasaki (), Ryuhoh Ide, Hector Brunel, Takumi Suzuki, Rajveer Nehra, Katsuki Nakashima, Takahiro Kashiwazaki, Asuka Inoue, Takeshi Umeki, Fumihiro China, Masahiro Yabuno, Shigehito Miki, Hirotaka Terai, Taichi Yamashima, Atsushi Sakaguchi, Kan Takase, Mamoru Endo, Warit Asavanant () and Akira Furusawa ()
Additional contact information
Akito Kawasaki: The University of Tokyo
Ryuhoh Ide: The University of Tokyo
Hector Brunel: The University of Tokyo
Takumi Suzuki: The University of Tokyo
Rajveer Nehra: The University of Tokyo
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
Mamoru Endo: The University of Tokyo
Warit Asavanant: The University of Tokyo
Akira Furusawa: The University of Tokyo

Nature Communications, 2024, vol. 15, issue 1, 1-8

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-53408-w

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