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Practical decoy-state quantum secure direct communication

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Abstract

Quantum secure direct communication (QSDC) has been demonstrated in both fiber-based and free-space channels using attenuated lasers. Decoy-state QSDC by exploiting four decoy states has been proposed to address the problem of photon-number-splitting attacks caused by the use of attenuated lasers. In this study, we present an analysis of the practical aspects of decoy-state QSDC. First, we design a two-decoy-state protocol that only requires two decoy states, thereby significantly reducing experimental complexity. Second, we successfully perform full parameter optimization for a real-life QSDC system by introducing a genetic algorithm. Our simulation results show that the two-decoy-state protocol could be the best choice for developing a practical QSDC system. Furthermore, full optimization is crucial for a high-performance QSDC system. Our work serves as a major step toward the further development of practical decoy-state QSDC systems.

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Authors and Affiliations

  1. Guangxi Key Laboratory for Relativistic Astrophysics, School of Physical Science and Technology, Guangxi University, Nanning, 530004, China

    Xin Liu, Zijian Li, Di Luo, Chunfeng Huang, Di Ma & Kejin Wei

  2. Guangxi Key Laboratory of Multimedia Communications and Network Technology, School of Computer, Electronics, and Information, Guangxi University, Nanning, 530004, China

    Minming Geng & Zhenrong Zhang

  3. CAS Quantum Network Co., Ltd, Shanghai, 201315, China

    Junwei Wang

Authors
  1. Xin Liu
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  2. Zijian Li
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  3. Di Luo
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  4. Chunfeng Huang
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  5. Di Ma
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  6. Minming Geng
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  7. Junwei Wang
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  9. Kejin Wei
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Corresponding author

Correspondence to Kejin Wei.

Additional information

This study was supported by the National Natural Science Foundation of China (Grant Nos. 62171144, 62031024, and 11865004), and the Guangxi Science Foundation (Grant No. 2017GXNSFBA198231). We thank D. Pan, L. Yin and G.-L. Long for very helpful discussions.

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Liu, X., Li, Z., Luo, D. et al. Practical decoy-state quantum secure direct communication. Sci. China Phys. Mech. Astron. 64, 120311 (2021). https://doi.org/10.1007/s11433-021-1775-4

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  • DOI: https://doi.org/10.1007/s11433-021-1775-4

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