Quantum Limits of Covert Target Detection,Physical Review Letters

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Quantum Limits of Covert Target Detection
Physical Review Letters ( IF 8.1 ) Pub Date : 2024-09-09 , DOI: 10.1103/physrevlett.133.110801
Guo Yao Tham ₁ , Ranjith Nair ₁ , Mile Gu _{1,

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Affiliation

In covert target detection, Alice attempts to send optical or microwave probes to determine the presence or absence of a weakly reflecting target embedded in thermal background radiation within a target region, while striving to remain undetected by an adversary, Willie, who is co-located with the target and collects all light that does not return to Alice. We formulate this problem in a realistic setting and derive quantum-mechanical limits on Alice’s error probability performance in entanglement-assisted target detection for any fixed level of her detectability by Willie. We demonstrate how Alice can approach this performance limit using two-mode squeezed vacuum probes in the regime of small to moderate background brightness, and how such protocols can outperform any conventional approach using Gaussian-distributed coherent states. In addition, we derive a universal performance bound for nonadversarial quantum illumination without requiring the passive-signature assumption.

中文翻译：

隐蔽目标检测的量子极限

在隐蔽目标检测中，爱丽丝尝试发送光学或微波探测器来确定目标区域内是否存在嵌入热背景辐射中的弱反射目标，同时努力不被位于同一地点的对手威利检测到与目标并收集所有不会返回到爱丽丝的光线。我们在现实环境中制定了这个问题，并推导出爱丽丝在纠缠辅助目标检测中的错误概率性能的量子力学限制，以应对威利对她的任何固定可检测性水平。我们演示了 Alice 如何在小到中等背景亮度的情况下使用双模压缩真空探针来接近这一性能极限，以及此类协议如何优于任何使用高斯分布相干态的传统方法。此外，我们得出了非对抗性量子照明的通用性能界限，而不需要被动签名假设。

更新日期：2024-09-10

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