Entanglement-assisted detection of fading targets via correlation-to-displacement conversion
Entanglement-assisted detection of fading targets via correlation-to-displacement conversion
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DOI：
10.1103/physreva.107.062405
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发表时间：
2022-12
影响因子：
2.9
通讯作者：
Xin Chen;Quntao Zhuang
中科院分区：
文献类型：
--
作者：
Xin Chen;Quntao Zhuang
量子照明利用纠缠增强的传感系统，在检测可疑目标方面优于经典照明，尽管存在纠缠破坏损失和噪声。然而，实现量子优势的实用和最佳接收器设计一直是一个长期开放的问题。最近，[arXiv：2207.06609]提出了相关到位移（“C$\rightarrow$D”）转换模块，以实现最佳接收器设计，其大大降低了先前已知的最佳接收器的复杂度[Phys.Rev.Lett. {\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相位的理想目标。然而，在实际应用中，目标往往诱导一个随机的返回相位，而且，它们的反射率可以有服从瑞利分布的波动。在这项工作中，我们扩展的C$\rightarrow$D模块的分析，以现实的目标，并表明，纠缠的优势是保持，虽然减少。特别地，转换模块允许精确和有效的性能评估，尽管所涉及的量子信道的非高斯性质。
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.