18-dB On-Chip Vacuum Squeezing in an Adaptively Poled Lithium Niobate Waveguide
Published in arXiv:2605.27607, 2026
Quantum squeezed states of light enable measurement sensitivities beyond classical limits and are a key resource for continuous-variable quantum information processing. In this work, we demonstrate continuous-wave quadrature squeezing in a 1.6-cm-long adaptively poled thin-film lithium niobate waveguide with propagation loss below 0.1 dB/cm. Using a distributed model that accounts for optical loss, phase noise, and nonlinear interaction strength, together with bidirectional second-harmonic-generation measurements, we infer an on-chip squeezing level of 18 dB and anti-squeezing exceeding 20 dB. These results represent the strongest squeezing reported on an integrated photonic platform and highlight the potential of thin-film lithium niobate for scalable quantum sensing, communications, and computing.
Recommended citation: Tushar Sanjay Karnik, Xinyi Ren, Chun-Ho Lee, Bo-Han Wu, Mihir Chaudhari, et al. (2026). arXiv preprint arXiv:2605.27607.
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