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International Journal of Theoretical Physics

Entanglement of Coupled Optomechanical Systems Improved by Optical Parametric Amplifiers

Guixia Pan, Ruijie Xiao, Ling Zhou

Published Apr 11, 2016• 5 citations
Publisher
DOI
10.1007/s10773-016-2999-6

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Abstract We investigate the effect of a degenerate optical parametric amplifier (OPA) placed inside an optomechanical cavity on the steady-state entanglement of two cavity modes, which jointly interact with a mechanical resonator. Two cavity modes are, respectively, driven at the red and blue sideband associated with the mechanical resonator, which generates entanglement between them in the limit of resolved sideband. The OPA gives rise to single-mode squeezing of the cavity fields, which results in significant improvement of the two-mode entanglement. It is found that an optimal nonlinear gain of the OPA exists, depending on the system temperatures, which yields the maximum entanglement. The improvement is particularly remarkable for the system at cryogenic temperatures.