In an optomechanical system consisting of two Fabry–Pérot cavities fed by squeezed light and coupled via Coulomb interaction, we respectively use the logarithmic negativity, Gaussian discord and Gaussian coherence to analyze the behavior of three different indicators of nonclassicality, namely the entanglement, quantum discord and quantum coherence. We perform the rotating wave approximation and work in the resolved sideband regime. In two bi-mode states (optical and mechanical), the coherence is generally found to be greater than entanglement and discord. More interestingly, we show that the Coulomb interaction can be used either to degrade or enhance the nonclassical properties of the optical subsystem. In addition, compared with the discord and coherence, the mechanical entanglement is found strongly sensitive to both thermal and Coulomb effects, and it requires a minimum value of cooperativity to be generated. Remarkably, this minimum increases when increasing the Coulomb coupling strength. Finally, we notice that an optimal transfer of quantum correlations between the optical and mechanical subsystems is achieved in the absence of the Coulomb interaction.

中文翻译：

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在库仑相互作用下控制光机械系统的非经典特性

在由两个由压缩光馈电并通过库仑相互作用耦合的法布里-珀罗腔组成的光机械系统中，我们分别使用对数负性、高斯不和谐和高斯相干性来分析三种不同的非经典指标的行为，即纠缠、量子不和谐和量子相干。我们执行旋转波近似并在已解决的边带状态下工作。在两种双模状态（光学和机械）中，通常发现相干性大于纠缠和不和谐。更有趣的是，我们表明库仑相互作用可用于降低或增强光学子系统的非经典特性。此外，与不和谐和连贯相比，发现机械纠缠对热效应和库仑效应都非常敏感，并且它需要产生一个最小值。值得注意的是，当增加库仑耦合强度时，这个最小值会增加。最后，我们注意到在没有库仑相互作用的情况下实现了光学和机械子系统之间量子相关性的最佳转移。