论文标题
通过相关性转换对衰落目标的纠缠辅助检测
Entanglement-assisted detection of fading targets via correlation-to-coherence conversion
论文作者
论文摘要
量子照明利用纠缠增强的传感系统在检测可疑目标方面胜过经典的照明，尽管纠缠了纠缠的损失和噪音。但是，实现量子优势的实用和最佳接收器设计是一个漫长的开放问题。最近，[arxiv：2207.06609]提出了相关性与位置（`c $ \ rightarrow $ d'）转换模块，以启用最佳接收器设计，从而大大降低了先前已知的最佳接收器的复杂性。莱特牧师。 {\ bf 118}，040801（2017）]。在那里，转换模块的分析假设具有已知反射率和固定返回阶段的理想目标。但是，在实际应用中，目标通常会引起随机回返阶段。此外，它们的反射能力可能会遵守瑞利（Rayleigh）分发。在这项工作中，我们将C $ \ rightarrow $ d模块的分析扩展到了现实的目标，并表明尽管降低了纠缠优势。特别是，尽管涉及量子通道的非高斯性质，但转换模块允许精确有效的性能评估。
Quantum illumination utilizes an entanglement-enhanced sensing system to outperform classical illumination in detecting a suspected target, despite the entanglement-breaking loss and noise. However, practical and optimal receiver design to fulfil the quantum advantage has been a long open problem. Recently, [arXiv:2207.06609] proposed the correlation-to-displacement (`C$\rightarrow$D') conversion module to enable an optimal receiver design that greatly reduces the complexity of the previous known optimal receiver [Phys. Rev. Lett. {\bf 118}, 040801 (2017)]. There, the analyses of the conversion module assume an ideal target with a known reflectivity and a fixed return phase. In practical applications, however, targets often induce a random return phase; moreover, their reflectivities can have fluctuations obeying a Rayleigh-distribution. In this work, we extend the analyses of the C$\rightarrow$D module to realistic targets and show that the entanglement advantage is maintained albeit reduced. In particular, the conversion module allows exact and efficient performance evaluation despite the non-Gaussian nature of the quantum channel involved.
