Quantum-enhanced sensing has a goal of enhancing a parameter sensitivity with input quantum states, while quantum illumination has a goal of enhancing a target detection capability with input entangled states in a heavy noise environment. Here we propose a concatenation between quantum-enhanced sensing and quantum illumination that can take quantum advantage over the classical limit. First, phase sensing in an interferometry is connected to a target sensing via quantum Fisher information. Second, the target sensitivity is investigated in noisy quantum-enhanced sensing. Under the same input state energy, for example, $N$-photon entangled states can exhibit better performance than a two-mode squeezed vacuum state and a separable coherent state. Incorporating a photon-number difference measurement, finally, the noisy target sensitivity is connected to a signal-to-noise ratio which is associated with a minimum error probability of discriminating the presence and absence of the target. We show that both the target sensitivity and the signal-to-noise ratio can be enhanced with increasing thermal noise.

中文翻译：

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通过量子增强传感的量子照明

量子增强感测的目的是通过输入量子态来增强参数灵敏度，而量子照明的目的是在重噪声环境中通过输入纠缠态来增强目标检测能力。在这里，我们提出了在量子增强的传感和量子照明之间的级联，该级联可以利用量子优势超越经典极限。首先，干涉仪中的相位感应通过量子Fisher信息连接到目标感应。其次，在噪声量子增强传感中研究目标灵敏度。例如，在相同的输入状态能量下，$ñ$光子纠缠态比双模压缩真空态和可分离的相干态表现出更好的性能。最后，结合光子数差测量，将带噪目标灵敏度连接到信噪比，该信噪比与区分目标存在和不存在的最小错误概率相关。我们表明，随着热噪声的增加，目标灵敏度和信噪比均可提高。