A foundry-fabricated Si3N4 microring produces 3.7 dB of directly detected twin-beam squeezing, consistent with an overcoupling model and implying roughly 10.7 dB on-chip.
Boyer et al., Entangled images from four-wave mixing, Science 321, 544 (2008)
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Strong nanophotonic quantum squeezing exceeding 3.5 dB in a foundry-compatible Kerr microresonator
A foundry-fabricated Si3N4 microring produces 3.7 dB of directly detected twin-beam squeezing, consistent with an overcoupling model and implying roughly 10.7 dB on-chip.