One-shot detection limits of quantum illumination with discrete signals

Yung，Man Hong1,2; Meng，Fei1,3; Zhang，Xiao Ming4; Zhao，Ming Jing5

2020-12-01

10.1038/s41534-020-00303-z

npj Quantum Information   影响因子和分区

2056-6387

2056-6387

To detect a stealth target, one may directly probe it with a single photon and analyze the reflected signals. The efficiency of such conventional detection scheme can potentially be enhanced by quantum illumination, where entanglement is exploited to break the classical limits. The question is what is the optimal signal state for achieving the detection limit? Here, we address this question in a general discrete model, and derive a complete set of analytic solutions. For one-shot detection, the parameter space can be classified into three distinct regions, in the form of a “phase diagram” for both conventional and quantum illumination. Interestingly, whenever the reflectivity of the target is less than some critical value, all received signals become useless, which is true even if entangled resources are employed. However, there does exist a region where quantum illumination can provide advantages over conventional illumination; there, the optimal signal state is an entangled state with an entanglement spectrum inversely proportional to the spectrum of the environmental noise state and is, surprisingly, independent of the occurrence probability and the reflectivity of the object. The entanglement of the ideal probe state increases with the entropy of the environment; it becomes more entangled as the temperature of the environment increases. Finally, we show that the performance advantage cannot be fully characterized by any measure of quantum correlation, unless the environment is a complete mixed state.

SCI ; EI

英语

第一

Natural Science Foundation of Guangdong Province[2017B030308003] ; Key R&D Program of Guangdong Province[2018B030326001] ; Science, Technology and Innovation Commission of Shenzhen Municipality[JCYJ20170412152620376][JCYJ20170817105046702][KYTDPT20181011104202253] ; National Natural Science Foundation of China[11875160][U1801661] ; Economy, Trade and Information Commission of Shenzhen Municipality[201901161512] ; Guangdong Provincial Key Laboratory[2019B121203002]

Physics

Quantum Science & Technology ; Physics, Applied ; Physics, Atomic, Molecular & Chemical ; Physics, Condensed Matter

WOS:000565767900001

NATURE PUBLISHING GROUP

20203609134356

Particle beams ; Probes ; Signal detection ; Quantum entanglement

Information Theory and Signal Processing:716.1 ; Quantum Theory; Quantum Mechanics:931.4 ; High Energy Physics:932.1

2-s2.0-85090083053

Scopus

1.Shenzhen Institute for Quantum Science and Engineering and Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China
2.Guangdong Provincial Key Laboratory of Quantum Science and Engineering,Shenzhen Institute for Quantum Science and Engineering,Southern University of Science and Technology,Shenzhen,518055,China
3.Department of Computer Science,The University of Hong Kong,Pokfulam,Pokfulam Road,Hong Kong
4.Department of Physics,City University of Hong Kong,Tat Chee Avenue,Kowloon,Hong Kong
5.School of Science,Beijing Information Science and Technology University,Beijing,100192,China

Yung，Man Hong,Meng，Fei,Zhang，Xiao Ming,et al. One-shot detection limits of quantum illumination with discrete signals[J]. npj Quantum Information,2020,6(1).

Yung，Man Hong,Meng，Fei,Zhang，Xiao Ming,&Zhao，Ming Jing.(2020).One-shot detection limits of quantum illumination with discrete signals.npj Quantum Information,6(1).

Yung，Man Hong,et al."One-shot detection limits of quantum illumination with discrete signals".npj Quantum Information 6.1(2020).