调制光学参量放大器对双机械振子量子纠缠与压缩的影响

Effect of modulated optical parametric amplifier on quantum entanglement and compression of dual mechanical oscillators

为了研究包含调制光参量放大器(optical parametric amplifier,OPA)的双机械振子腔光力系统中的量子纠缠和机械压缩,通过数值求解和解析求解,讨论了系统的有关参数,如OPA相位、调制频率、热声子数和相位增益量在腔光力系统中对量子纠缠和机械压缩的影响,重点分析了调制OPA对产生力学纠缠和机械压缩的作用.结果表明:本光学腔不需要额外的压缩光来驱动,并在较易实现的参数条件下通过调制OPA增强了2个机械振子间的纠缠.当系统处于稳定状态时,在边带可分辩和不可分辨条件下均可产生机械压缩,并可通过调制OPA在边带可分辨条件下实现强机械压缩.此外,在调制OPA的辅助下,机械振子间的纠缠和机械压缩对环境温度具有很强的鲁棒性.

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.