Ultra-fast Continuous-wave Homodyne Measurement of Schrödlnger Cat States with 40-ps Wavepackets

Light has a high carrier frequency of hundreds of THz and has the potential to realize ultrafast quantum information processing. Time-domain multiplexed continuous-variable optical quantum computation has recently attracted much attention [1]. In this method, it is important to encode optical quantum states in wavepackets with short temporal widths because the width of the quantum state determines the clock frequency of the computation. So far, in the continuous-wave (CW) light field, this wavepacket width has been limited by the bandwidth of homodyne measurements, which read out the quadratures of the quantum state. Recently, a technique using phase-sensitive amplifiers (PSAs) and broadband homodyne detectors with CW light has been developed [2]. Using that, the wavepacket width of quantum entangled states was successfully shortened to the picosecond scale [3]. However, the wavepacket width of the Schrödinger cat state, which is a phase-sensitive non-Gaussian state, was limited to the sub-nanosecond scale due to the timing jitter of the photon detector [4].

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Published
2025-06-23
DOI
https://doi.org/10.1109/cleo/europe-eqec65582.2025.11109412
Primary Topic
Photorefractive and Nonlinear Optics
Type
article
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article

Ultra-fast Continuous-wave Homodyne Measurement of Schrödlnger Cat States with 40-ps Wavepackets

Taichi Yamashima, Hirotaka Terai, Tatsuki Sonoyama, Takahiro Kashiwazaki et al.
Photorefractive and Nonlinear Optics
article

Ultra-fast Continuous-wave Homodyne Measurement of Schrödlnger Cat States with 40-ps Wavepackets

Taichi Yamashima, Hirotaka Terai, Tatsuki Sonoyama, Takahiro Kashiwazaki, Asuka Inoue, Akito Kawasaki, Warit Asavanant, Kan Takase, Takeshi Umeki, Katsuki Nakashima, Akira Furusawa, Shigehito Miki, Masahiro Yabuno, Mamoru Endo, Takumi Suzuki
article en

Abstract

Light has a high carrier frequency of hundreds of THz and has the potential to realize ultrafast quantum information processing. Time-domain multiplexed continuous-variable optical quantum computation has recently attracted much attention [1]. In this method, it is important to encode optical quantum states in wavepackets with short temporal widths because the width of the quantum state determines the clock frequency of the computation. So far, in the continuous-wave (CW) light field, this wavepacket width has been limited by the bandwidth of homodyne measurements, which read out the quadratures of the quantum state. Recently, a technique using phase-sensitive amplifiers (PSAs) and broadband homodyne detectors with CW light has been developed [2]. Using that, the wavepacket width of quantum entangled states was successfully shortened to the picosecond scale [3]. However, the wavepacket width of the Schrödinger cat state, which is a phase-sensitive non-Gaussian state, was limited to the sub-nanosecond scale due to the timing jitter of the photon detector [4].

NEC (Japan) (JP), Tokyo University of the Arts (JP), NTT (Japan) (JP), NTT Basic Research Laboratories (JP), The University of Tokyo (JP), National Institute of Information and Communications Technology (JP)
Affordable and clean energy
Openalex Percentile: Top 84%
Photorefractive and Nonlinear Optics
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