Two cascaded silicon nitride micro-rings on one chip amplify and measure squeezed light before off-chip loss, yielding 4.6 dB observed squeezing despite 7 dB downstream loss.
Najafi,et al., On-chip detection of non-classical light by scalable integration of single-photon detectors.Nature communications6(1), 5873 (2015)
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On-chip Quantum Measurement of Squeezing Generated from a Silicon Nitride Micro-ring Resonator
Two cascaded silicon nitride micro-rings on one chip amplify and measure squeezed light before off-chip loss, yielding 4.6 dB observed squeezing despite 7 dB downstream loss.