非经典光机械关联的贝叶斯优化
Bayesian optimization of non-classical optomechanical correlations
AI总结：
本文提出用贝叶斯优化自动调节光机械系统控制参数，以增强双模压缩等非经典关联，并在悬浮纳米球模型中证明高温和低量子协同性条件下仍可获得显著压缩。
摘要：
非经典关联为量子技术中的许多应用提供了资源，同时也有力证明了一个系统确实运行在量子区域。光机械系统可以被布置成在机械模式与传播光模式之间产生非经典关联（例如量子纠缠）。在此，我们通过对控制参数应用贝叶斯优化，提出对此类系统中量子关联产生过程进行自动化优化，其效果超出分析方法所能达到的范围。我们利用该系统的详细理论模型模拟了一个双模光机械压缩实验，并将可测量输出馈入贝叶斯优化过程。随后，该过程修改可控参数，以最大化非经典双模压缩及其探测，而不依赖于模型的内部工作机制。我们聚焦于悬浮纳米球系统，但所述技术广泛适用于光机械实验，也可更广泛地应用，尤其是在没有详细理论处理可用的情况下。我们发现，在与实验相关的热区域中，改变并优化大量控制参数的能力使人们能够获得较大的双模压缩值；否则，通过分析方法或试错方法发现这些参数将十分困难或难以处理。特别地，我们观察到，在共振边带附近调制驱动频率可实现更强的非经典关联。我们还观察到，我们的优化方法找到了能够在高温区域实现显著压缩的参数。这将可产生非经典关联的实验装置范围扩展到高量子协同性区域之外。
英文摘要：
Nonclassical correlations provide a resource for many applications in quantum technology as well as providing strong evidence that a system is indeed operating in the quantum regime. Optomechanical systems can be arranged to generate nonclassical correlations (such as quantum entanglement) between the mechanical mode and a mode of travelling light. Here we propose automated optimization of the production of quantum correlations in such a system, beyond what can be achieved through analytical methods, by applying Bayesian optimization to the control parameters. A two-mode optomechanical squeezing experiment is simulated using a detailed theoretical model of the system and the measurable outputs fed to the Bayesian optimization process. This then modifies the controllable parameters in order to maximize the non-classical two-mode squeezing and its detection, independently of the inner workings of the model. We focus on a levitated nano-sphere system, but the techniques described are broadly applicable in optomechanical experiments, and also more widely, especially where no detailed theoretical treatment is available. We find that in the experimentally relevant thermal regimes, the ability to vary and optimize a broad array of control parameters provides access to large values of two-mode squeezing that would otherwise be difficult or intractable to discover via analytical or trial and error methods. In particular we observe that modulation of the driving frequency around the resonant sideband allows for stronger nonclassical correlations. We also observe that our optimization approach finds parameters that allow significant squeezing in the high temperature regime. This extends the range of experimental setups in which non-classical correlations could be generated beyond the region of high quantum cooperativity.
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