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Demonstration of a Squeezed Light Source on Thin-Film Lithium Niobate with Modal Phase Matching
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Squeezed states are essential for continuous variable (CV) quantum information processing, with wide-ranging applications in computing, sensing and communications. Integrated photonic circuits provide a scalable, convenient platform for building large CV circuits. Thin-film Lithium Niobate (TFLN) is particularly promising due to its low propagation loss, efficient parametric down conversion, and fast electro-optical modulation. In this work, we demonstrate a squeezed light source on an integrated TFLN platform, achieving a measured shot noise reduction of 0.46 dB using modal phase matching and grating couplers with an efficiency of up to -2.2 dB. The achieved squeezing is comparable to what has been observed using more complex circuitry based on periodic poling. The simpler design allows for compact, efficient and reproducible sources of squeezed light.
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Cited by 2 Pith papers
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Wafer-Scale Squeezed-Light Chips
A CMOS-compatible silicon nitride platform generates two-mode squeezed light with 2.9-3.1 dB across eight dies on a 4-inch wafer, with less than 0.2 dB variation.
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Integrated bright source of polarization-entangled photons using lithium niobate photonic chips
A lithium niobate photonic chip generates polarization-entangled photon pairs with concurrence 0.900 and fidelity 0.944, the first such demonstration on thin-film lithium niobate.
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