Entanglement-assisted detection of fading targets via correlation-to-coherence conversion

• URL: http://arxiv.org/abs/2212.08190v1
• Date: Thu, 15 Dec 2022 23:22:10 GMT
• Title: Entanglement-assisted detection of fading targets via correlation-to-coherence conversion
• Authors: Xin Chen and Quntao Zhuang
• Abstract summary: We extend the analyses of the correlation-to-displacement (C$rightarrow$D') conversion module to realistic targets. In particular, the conversion module allows exact and efficient performance evaluation despite the non-Gaussian nature of the quantum channel involved.
• Score: 4.561601261042468
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: 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.

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