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arXiv 2208.09641quant-phphysics.optics
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利用 cross-Kerr 效应实现多个简并机械模式的同时基态冷却

Simultaneous ground-state cooling of multiple degenerate mechanical modes through cross-Kerr effect

Pengyu Wen, Xuan Mao, Min Wang, Chuan Wang, Gui-Qin Li, Gui-Lu Long

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5 pages, 4 figures
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AI总结：

针对多个简并机械模式因暗模式效应难以同时基态冷却的问题，提出引入 cross-Kerr 非线性打破暗模式，并给出最佳耦合与激光功率及 N 模式扩展条件。

摘要：

由于暗模式效应的存在，在光机械系统中实现多个简并机械模式的同时基态冷光是一个难题。本文提出一种通用且可扩展的方法，通过引入 cross-Kerr（CK）非线性来打破两个简并机械模式的暗模式效应。在 CK 效应存在时，我们的方案最多可获得四个稳定稳态，这不同于标准光机械系统的双稳行为。在恒定输入激光功率下，CK 非线性可以调节有效失谐和机械共振频率，从而产生一个用于冷却的最佳 CK 耦合强度。类似地，当 CK 耦合强度保持固定时，也会存在一个用于冷却的最佳输入激光功率。通过引入不止一个 CK 效应，我们的方案可以推广用于打破多个简并机械模式的暗模式效应。为了满足 N 个简并机械模式同时基态冷却的要求，需要 N−1 个具有不同强度的 CK 效应。本提议为暗模式控制提供了新的见解，并可能为在宏观系统中操控多个量子态铺平道路。

英文摘要：

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.

机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。

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