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.
Zhao,et al., Near-degenerate quadrature-squeezed vacuum generation on a silicon-nitride chip.Physical Review Letters124(19), 193601 (2020)
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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.