论文标题
具有增强性能的巨型基于巨型的量子传感器
Giant-cavity-based quantum sensors with enhanced performance
论文作者
论文摘要
最近的进展表明，具有多个位置依赖性耦合的量子系统，例如巨型原子，可以表现出一些非常规现象，例如非指数衰变等。但是，它们的潜在应用仍然是空的问题。在本文中，我们首次提出了一种基于巨型腔的量子传感器，与传统的基于空腔的传感器相比，其性能可以大大提高。在我们的提案中，两个腔夫妇以多个点夫妇与耗散的水库融为一体，而他们以单点的方式将收益储层融为一体。为了使用该传感器检测未知参数，波导耦合到一个空腔之一，该空腔可以通过检测场可以通过以进行同源性检测。我们发现，多个依赖位置的耦合可以诱导腔之间固有的非对流耦合，从而可以增强传感器的性能。我们方案中的输出噪声可以降低到射击噪声水平，该噪声水平比参考文献的结果低约一个级级。 [自然通讯，2018，9，4320。]。此外，每个光子的信噪比也通过约一个数量级增强。这些结果表明，多点耦合结构对当今的量子设备有益。
Recent progresses have revealed that quantum systems with multiple position-dependent couplings, e.g., giant atoms, can exhibit some unconventional phenomena, such as non-exponential decay etc. However, their potential applications are still open questions. In this paper, we propose a giant-cavity-based quantum sensor for the first time, whose performance can be greatly enhanced compared to traditional cavity-based sensors. In our proposal, two cavities couple to a dissipative reservoir at multiple points while they couple to a gain reservoir in a single-point way. To detecting a unknown parameter using this sensor, a waveguide is coupled to one of the cavities where detecting fields can pass through for homodyne detection. We find that multiple position-dependent couplings can induce an inherent non-reciprocal coupling between the cavities, which can enhance the performance of sensors. Output noise in our scheme can be reduced to the shot noise level, which is about one order magnitude lower than the results in Ref. [Nature Communications, 2018, 9, 4320.]. Besides, the signal-to-noise ratio per photon is also enhanced by about one order of magnitude. These results show that the multiple-point-coupling structure is beneficial to nowadays quantum devices.
