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Optimized decision strategy for quadrature phase-shift-keying unambiguous states discrimination

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Abstract

Quantum-enhanced measurement can unambiguously discriminate coherent states with accuracy beyond what is fundamentally possible with conventional technologies. However, this advantage can be achieved only if quantum-enhanced measurement technologies are robust against to real-world imperfections. Improving resistance to real-world imperfections such as imperfect interference and dark count rate to enhance performance is of particular importance for an unambiguous state discrimination scenario. In this paper, we demonstrate an optimized decision strategy for quadrature phase-shift-keying unambiguous states discrimination, which to make the correct probability close to optimal. In addition, the error probability of the scheme is lower than ideal heterodyne measurement scheme when the average photon number of the signal is less than 4.5. The optimized decision strategy is based on the probability of photon-detection in measurement. Our demonstration shows that optimized decision strategy can provide practical advantages over conventional technologies for coherent optical communication.

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Data availability

The datasets generated during and analyzed during the current study are available from the corresponding author on reasonable request.

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Acknowledgements

This research was supported in part by grants from the National Natural Science Foundation of China (62101559); National key basic research program of China (2021-JCJQ-JJ-0510); Scientific research program of National University of Defense Science and technology (ZK21-37). the Innovative Key Projects Promotion in Information and Communication College (No. YJKT-ZD-2105), the National University of Defense Technology under Grant No. 19-QNCXJ.

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Authors and Affiliations

  1. Institute of Information and Communication, National University of Defense Technology, Xi’an, 710106, China

    Chang Guo, Tianyi Wu, Kai Li, Xingyu Wang, Xiaowen Liu, Yijun Zhang & Chen Dong

  2. Institute of Information and Navigation, Air Force Engineering University, Xi’an, 710077, China

    Xingyu Wang

  3. Graduate School, Rocket Force University of Engineering, Xi’an, 710025, China

    Yijun Zhang

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  1. Chang Guo
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Correspondence to Chen Dong.

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Guo, C., Wu, T., Li, K. et al. Optimized decision strategy for quadrature phase-shift-keying unambiguous states discrimination. Quantum Inf Process 21, 229 (2022). https://doi.org/10.1007/s11128-022-03566-x

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