Classical benchmarking for microwave quantum illumination

IF 2.5 Q3 QUANTUM SCIENCE & TECHNOLOGY IET Quantum Communication Pub Date : 2021-11-25 DOI:10.1049/qtc2.12025
Athena Karsa, Stefano Pirandola
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引用次数: 6

Abstract

Quantum illumination theoretically promises up to a 6 dB error-exponent advantage in target detection over the best classical protocol. The advantage is maximised by a regime that includes a very high background, which occurs naturally when one considers microwave operation. Such a regime has well-known practical limitations, though it is clear that, theoretically, knowledge of the associated classical benchmark in the microwave is lacking. The requirement of amplifiers for signal detection necessarily renders the optimal classical protocol here different to that which is traditionally used, and only applicable in the optical domain. This work outlines what is the true classical benchmark for the microwave Quantum illumination using coherent states, providing new bounds on error probability and closed formulae for the receiver operating characteristic, for both optimal (based on quantum relative entropy) and homodyne detection schemes. An alternative source generation procedure based on coherent states is also proposed, which demonstrates the potential to make classically optimal performances achievable in optical applications. The same bounds and measures for the performance of such a source are provided, and its potential utility in the future of room temperature quantum detection schemes in the microwave is discussed.

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微波量子照明的经典基准测试
理论上,量子照明在目标检测方面比最佳的经典协议具有高达6 dB的误差指数优势。当人们考虑微波操作时,这种优势会在一个包含非常高背景的环境中得到最大化。虽然很明显,在理论上,缺乏与微波相关的经典基准的知识,但这种制度具有众所周知的实际局限性。放大器对信号检测的要求必然使得这里的最佳经典协议与传统使用的协议不同,并且只适用于光域。这项工作概述了使用相干态的微波量子照明的真正经典基准,为最佳(基于量子相对熵)和纯差检测方案提供了错误概率的新界限和接收器工作特性的封闭公式。本文还提出了一种基于相干态的源生成方法,证明了在光学应用中实现经典最佳性能的潜力。给出了这种源的性能限值和测量方法,并讨论了它在未来微波室温量子探测方案中的潜在应用。
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