Hybridization of pulse and continuous-wave based optical quantum computation

• URL: http://arxiv.org/abs/2512.00543v1
• Date: Sat, 29 Nov 2025 16:27:54 GMT
• Title: Hybridization of pulse and continuous-wave based optical quantum computation
• Authors: Tatsuki Sonoyama, Tomoki Sano, Takumi Suzuki, Kazuma Takahashi, Takefumi Nomura, Akito Kawasaki, Asuka Inoue, Takahiro Kashiwazaki, Takeshi Umeki, Masahiro Yabuno, Shigehito Miki, Hirotaka Terai, Kan Takase, Warit Asavanant, Mamoru Endo, Akira Furusawa,
• Abstract summary: We propose a pulse and continuous wave (CW) hybrid architecture of continuous-variable measurement-based optical quantum computation.<n>In this architecture, input and ancillary non-Gaussian quantum states necessary for fault-tolerance and universality of quantum computing are generated with pulsed light.<n> quantum processors including continuous-variable cluster states and homodyne measurement systems are operated with CW light.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: We propose a pulse and continuous wave (CW) hybrid architecture of continuous-variable measurement-based optical quantum computation utilizing the strengths of both pulsed and CW light. In this architecture, input and ancillary non-Gaussian quantum states necessary for fault-tolerance and universality of quantum computing are generated with pulsed light, whereas quantum processors including continuous-variable cluster states and homodyne measurement systems are operated with CW light. This architecture is expected to enable both generation of quantum states with shorter optical wavepackets and low-loss manipulation and measurement of these states, thus is compatible with ultrafast and low-loss quantum information processing. In this study, as a proof-of-principle, an ultrafast homodyne measurement using CW local oscillator was performed on single-photon states generated with pulsed light. The measured single-photon state's temporal width was around 70 ps and the value of the Wigner function at the origin was W(0,0) = -0.153 +/- 0.003, which is highly non-classical. This will be a core technology for realizing high-speed optical quantum information processing.

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