Strong optomechanical squeezing of light

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Abstract

We create squeezed light by exploiting the quantum nature of the mechanical interaction between laser light and a membrane mechanical resonator embedded in an optical cavity. The radiation-pressure shot noise (fluctuating optical force from quantum laser amplitude noise) induces resonator motion well above that of thermally driven motion. This motion imprints a phase shift on the laser light, hence correlating the amplitude and phase noise, a consequence of which is optical squeezing. We experimentally demonstrate strong and continuous optomechanical squeezing of 1:7 ± 0:2dB below the shot-noise level. The peak level of squeezing measured near the mechanical resonance is well described by a model whose parameters are independently calibrated and that includes thermal motion of the membrane with no other classical noise sources.

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Purdy, T. P., Yu, P. L., Peterson, R. W., Kampel, N. S., & Regal, C. A. (2014). Strong optomechanical squeezing of light. Physical Review X, 3(3). https://doi.org/10.1103/PhysRevX.3.031012

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