Effect of modulated optical parametric amplifier on quantum entanglement and compression of dual mechanical oscillators
To study the quantum entanglement and mechanical compression in a cavity optomechanical system containing a modulated optical parametric amplifier(OPA)with a double mechanical oscillator,the effects of the relevant parameters of the system,such as OPA phase,modulation frequency,thermal phonon number and phase gain amount on quantum entanglement and mechanical compression in the cavity optomechanical system are discussed by numerical solutions and analytical solutions,with emphasis on the role of modulated OPA in producing mechanical entanglement and mechanical compression.The results show that the present optical cavity does not require additional compressed light to drive it and enhances the entanglement between two mechanical oscillators by modulating OPA under more easily realisable parametric conditions.In the steady state of the system,mechanical compression can be produced for both sideband distinguishable and sideband indistinguishable condi-tions,and strong mechanical compression can be achieved in the sideband distinguishable condition by modulating the OPA.In addition,with the aid of modulated OPA,the mechanical inter-vibrator entanglement and mechanical compression are robust to ambient temperature.
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