Quadrature-squeezed Light Detection Using a Self-generated Matched Local Oscillator

Recent quadrature-squeezing experiments have greatly reduced the amount of observed quantum noise in a system. The cw squeezed light generated from a sub-threshold optical parametric oscillator resulted in 6.0 dB (75%) of noise reduction1 and 5.1 dB (69%) of pulsed squeezing was observed in traveling-wave fiber ring experiments. However, the pulsed squeezed light generated from a single-pass traveling-wave optical parametric amplifier (OPA) has not yielded more than 2 dB (37%) of noise reduction, despite a number of attempts. This is rather puzzling because the intensity noises of the signal and idler beams at the output of the same OPA were correlated by as much as 7 dB (80%).

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