论文标题
通过交叉凯尔效应的多种退化机械模式的同时进行地面状态冷却
Simultaneous ground-state cooling of multiple degenerate mechanical modes through cross-Kerr effect
论文作者
论文摘要
由于存在暗模式效应，因此多种退化机械模式的同时进行多个退化机械模式的地面冷却是一个棘手的问题。在这里，我们提出了一种通用且可扩展的方法，以通过引入跨Kerr（CK）非线性来打破两种退化机械模式的暗模式效应。在CK效应的情况下，我们的方案中最多可以实现四种稳定的稳态，这与标准光力学系统的可行行为不同。在恒定的输入激光功率下，可以通过CK非线性调节有效的引导和机械谐振频率，从而导致最佳的CK耦合强度用于冷却。同样，当CK耦合强度保持固定时，将有最佳的输入激光功率来冷却。我们的方案可以扩展以通过引入多个CK效应来打破多种退化机械模式的暗模式效应。为了满足n个多个退化机械模式的同时基层冷却n-1 ck效应，需要具有不同的强度。我们的建议在黑暗模式控制下提供了新的见解，并可能为操纵宏观系统中多个量子状态的方式铺平了道路。
Simultaneous ground-state cooling of multiple degenerate mechanical modes is a tough issue in optomechanical system due to the existence of the dark mode effect. Here we propose a universal and scalable method to break the dark mode effect of two degenerate mechanical modes by introducing the cross-Kerr (CK) nonlinearity. At most four stable steady states can be achieved in our scheme in the presence of the CK effect, different from the bistable behavior of the standard optomechanical system. Under the constant input laser power, the effective detuning and mechanical resonant frequency can be modulated by the CK nonlinearity, which results in an optimal CK coupling strength for cooling. Similarly, there will be an optimal input laser power for cooling when the CK coupling strength stays fixed. Our scheme can be extended to break the dark mode effect of multiple degenerate mechanical modes by introducing more than one CK effects. To fulfill the requirement of the simultaneous ground-state cooling of N multiple degenerate mechanical modes N-1 CK effects with different strengths are needed. Our proposal provides new insights in dark mode control and might pave the way to manipulating of multiple quantum states in macroscopic system.
