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arXiv:1703.02666 · Journal of Physics B Atomic Molecular and Optical Physics

Enhanced entanglement of two optical modes in optomechanical systems via an optical parametric amplifier

Rong-Guo Yang, Ni Li, Jing Zhang, Jie Li, Tian-Cai Zhang

Published Mar 29, 2017• 22 citations
arXivHTMLPDF

Abstract

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.

DOI
10.1088/1361-6455/aa64c1

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