Abstract Quantum radar has recently gained increasing importance in a number of military applications. The estimation accuracy of one-shot quantum illumination events is significant in target detection. However, the accuracy is inevitably deteriorated by measurement noises. The traditional one-shot illumination emits a single photon towards a certain area which thermal noise exists in the path to, and the states of the received photons are hard to distinguish in the following processing. Therefore, a new optical probe source is proposed in this work. The independent detecting unit in the enhanced illumination is comprised of two photons aligned in time by using Hong-Ou-Mandel (HOM) interferometer. Further, one-shot detection in a general discrete model is realized and it proves a significant promotion in accuracy. The expansion of useful parts in parameter space and the lower minimal error probability for hypothesis testing have been mathematically demonstrated. The accuracy of one-shot detection can be effectively improved by the proposed scheme implying that it possesses great potential applications in quantum illumination and imaging.
Fund: Project supported by the National Natural Science Foundation of China (Grant No. 62071363) and the Key Research and Development Program of Shaanxi Province, China (Grant No. 2021LLRH-06).
Wen-Long Gao(高文珑), Lu-Ping Xu(许录平), Hua Zhang(张华), Bo Yan(阎博), Peng-Xian Li(李芃鲜), and Gui-Ting Hu(胡桂廷) One-shot detection limits of time-alignment two-photon illumination radar 2023 Chin. Phys. B 32 050304
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