论文标题
通过部分可访问性探测非线性混合动力学系统
Probing of nonlinear hybrid optomechanical systems via partial accessibility
论文作者
论文摘要
杂种光学系统正在成为量子技术的富有成果的建筑。因此，确定相关的原子光和光机械耦合是此类系统中的重要任务。在非平衡动力学期间，这些耦合的指纹留在系统的全局状态。但是，实际上，对整个系统进行测量是不可行的，因此，必须依靠对一个子系统的部分访问，即原子，光或力学。在这里，我们执行全面的分析，以确定探测耦合的最佳子系统。我们发现，如果轻型机械耦合是已知的或无关紧要的，具体取决于Qubit-Light耦合的范围，那么最佳子系统可以是光或量子。在其他情况下，例如同时估计耦合，光通常是最佳子系统。这可以解释为光线是其他两个子系统之间的中介。最后，我们表明，使用广泛使用的同伴检测可以从轻度自由度中提取有关耦合信息的相当一部分。
Hybrid optomechanical systems are emerging as a fruitful architecture for quantum technologies. Hence, determining the relevant atom-light and light-mechanics couplings is an essential task in such systems. The fingerprint of these couplings is left in the global state of the system during non-equilibrium dynamics. However, in practice, performing measurements on the entire system is not feasible, and thus, one has to rely on partial access to one of the subsystems, namely the atom, the light, or the mechanics. Here, we perform a comprehensive analysis to determine the optimal subsystem for probing the couplings. We find that if the light-mechanics coupling is known or irrelevant, depending on the range of the qubit-light coupling, then the optimal subsystem can be either light or the qubit. In other scenarios, e.g., simultaneous estimation of the couplings, the light is usually the optimal subsystem. This can be explained as light is the mediator between the other two subsystems. Finally, we show that the widely used homodyne detection can extract a fair fraction of the information about the couplings from the light degrees of freedom.
