Wei Rongyu, Li Jun, Wang Weihao, Meng Songhao, Zhang Baoshan, Guo Qinghua
Opt Express. 2022 Sep 26;30(20):36167-36175. doi: 10.1364/OE.468158.
It has been proved that quantum illumination (QI) radar has the quantum advantages in error-probability exponent. However, the error-probability exponent is not a recognized figure of merit in the radar literature, nor does it correspond in a straightforward manner to any such figure of merit. Signal to noise ratio (SNR) gain is an important criterion in radar theory. While, the theoretical analysis of quantum enhancement in SNR gain of QI radar has not been reported. In this paper, we compare the physical fundamental of matched filter (MF), which can achieve the optimal SNR gain under white noise in classical radar theory, and phase conjugation (PC) receiver. Furthermore, the quantum enhancement of SNR gain in QI radar is studied. It is shown that QI radar with practical receivers can achieve about 3dB quantum advantage in SNR gain. In addition, in the case of extremely weak signal, it can potentially achieve tens of dB enhancement in SNR gain compared with the MF based classical radar.
已证明量子照明（QI）雷达在误码率指数方面具有量子优势。然而，误码率指数在雷达文献中并非公认的品质因数，也不能直接对应于任何此类品质因数。信噪比（SNR）增益是雷达理论中的一个重要标准。然而，尚未有关于QI雷达信噪比增益量子增强的理论分析报道。在本文中，我们比较了在经典雷达理论中能在白噪声下实现最佳信噪比增益的匹配滤波器（MF）和相位共轭（PC）接收机的物理基础。此外，还研究了QI雷达中信噪比增益的量子增强。结果表明，采用实际接收机的QI雷达在信噪比增益方面可实现约3dB的量子优势。此外，在极弱信号的情况下，与基于MF的经典雷达相比，它有可能在信噪比增益方面实现数十dB的增强。
