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Journal of Physics B Atomic Molecular and Optical Physics

Optomechanically-generated photon–phonon single pairs with both discrete- and continuous-variable entanglements

Cun Yu, Zhenshan S. Yang, Xiang‐Guo Meng, Zhen‐Tao Zhang, Xia Zhang, Chenglin Bai

Published Jan 28, 2022• 0 citations
Publisher

Abstract

Abstract By exploiting two mechanical modes in an optomechanical resonator, photon–phonon single pairs with both discrete- and continuous-variable entanglements can be generated in a waveguide that is coupled to the resonator. The discrete- and continuous-variable entanglements in the photon–phonon pair can be independently controlled via adjusting the central frequency and spectral width of the input optical pump, respectively.

DOI
10.1088/1361-6455/ac4ff4

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Quantum entanglement is pivotal in modern quantum technologies, spanning applications from quantum networks to quantum metrology. Controllable quantum entanglement in cavity optomechanical systems has been an enduring pursuit. We propose a unique method for flexible manipulation and switching of optomechanical entanglement in a squeezed-cavity-assisted optomechanical system consisting of a χ (2) -nonlinear optical cavity and an optomechanical cavity. Squeezing the nonlinear optical cavity through parametric pumping allows effective control of light-light and light-vibration interactions within the system. This capability of the squeezed system plays a key role in manipulating quantum entanglement. We find that quantum entanglement between the unsqueezed cavity mode and the mechanical mode can be effectively regulated by adjusting the pump laser parameters. Furthermore, by turning the phase of the pump, we can achieve highly flexible quantum switching between entanglement and separability. Additionally, we demonstrate increased entanglement between the squeezed cavity mode and the mechanical mode when completely suppressing the pump-induced optical input noise. Our findings pave the way not only towards the manipulation and protection of fragile quantum entanglement but also to achieve photon-phonon quantum control by exploiting quantum squeezing.