Related papers: Generation of 10-dB squeezed light from a broadband waveguide optical parametric amplifier with improved phase locking method

Generation of 10-dB squeezed light from a broadband waveguide optical parametric amplifier with improved phase locking method

URL: http://arxiv.org/abs/2511.15082v2
Date: Thu, 20 Nov 2025 03:43:39 GMT
Title: Generation of 10-dB squeezed light from a broadband waveguide optical parametric amplifier with improved phase locking method
Authors: Kazuki Hirota, Takahiro Kashiwazaki, Gyeongmin Ha, Taichi Yamashima, Pawaphat Jaturaphagorn, Takumi Suzuki, Kazuma Takahashi, Akito Kawasaki, Asuka Inoue, Warit Asavanant, Mamoru Endo, Takeshi Umeki, Akira Furusawa,
Abstract summary: We report generation of 10.1pm-0.2dB squeezed light from a broadband periodically poled lithium niobate (PPLN) waveguide optical parametric amplifier (OPA)<n>We introduce a novel phase detection technique that does not require tapping a part of the squeezed light to get a phase locking signal.<n>With all these improvements, the phase fluctuation angle is reduced from 14 mrad to 9 mrad, and the total optical loss from 12% to 8%.
Score: 0.0
License: http://creativecommons.org/licenses/by/4.0/
Abstract: We report generation of 10.1\pm0.2-dB squeezed light from a broadband periodically poled lithium niobate (PPLN) waveguide optical parametric amplifier (OPA). Based on our previous report where a similar PPLN waveguide shows 8.3-dB squeezing [T. Kashiwazaki et al., Appl. Phys. Lett. 122, 234003 (2023)], we reduce phase fluctuations and overall optical losses in the measurement system. In particular, we introduce a novel phase detection technique that does not require tapping a part of the squeezed light to get a phase locking signal. We use a phase-detection OPA seeded by a tapped probe and pump light before a squeezer OPA. This configuration breaks the conventional trade-off between generating a phase-locking signal with high-signal-to-noise ratio and suppressing degradation of squeezing level caused by optical tapping. With all these improvements, the phase fluctuation angle is reduced from 14 mrad to 9 mrad, and the total optical loss from 12\% to 8\%. Achieving more than 10 dB of squeezing by the broadband waveguide OPA is a significant step towards realization of fault-tolerant ultra-fast universal optical quantum computation.

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