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Parameter optimization in biased decoy-state quantum key distribution with both source errors and statistical fluctuations

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Abstract

The decoy-state method has been widely used in commercial quantum key distribution (QKD) systems. In view of the practical decoy-state QKD with both source errors and statistical fluctuations, we propose a universal model of full parameter optimization in biased decoy-state QKD with phase-randomized sources. Besides, we adopt this model to carry out simulations of two widely used sources: weak coherent source (WCS) and heralded single-photon source (HSPS). Results show that full parameter optimization can significantly improve not only the secure transmission distance but also the final key generation rate. And when taking source errors and statistical fluctuations into account, the performance of decoy-state QKD using HSPS suffered less than that of decoy-state QKD using WCS.

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Acknowledgements

We gratefully acknowledge the financial support from the National Key Research and Development Program of China through Grant No. 2017YFA0304100, the National Natural Science Foundation of China through Grants Nos. 61475197 and 61590932, the Natural Science Foundation of the Jiangsu Higher Education Institutions through Grant No. 15KJA120002, the Outstanding Youth Project of Jiangsu Province through Grant No. BK20150039, the Priority Academic Program Development of Jiangsu Higher Education Institutions through Grant No. YX002001, and the NUPTSF through Grant No. NY217006.

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Author notes

  1. Jian-Rong Zhu and Jian Li contributed equally to this work.

Authors and Affiliations

  1. Institute of Signal Processing Transmission, Nanjing University of Posts and Telecommunications, Nanjing, 210003, China

    Jian-Rong Zhu, Jian Li, Chun-Mei Zhang & Qin Wang

  2. Key Lab of Broadband Wireless Communication and Sensor Network Technology, Nanjing University of Posts and Telecommunications, Ministry of Education, Nanjing, 210003, China

    Jian-Rong Zhu, Jian Li, Chun-Mei Zhang & Qin Wang

  3. Department of Physics, Southeast University, Nanjing, 211189, China

    Jian Li

Authors
  1. Jian-Rong Zhu
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  2. Jian Li
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Correspondence to Qin Wang.

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Zhu, JR., Li, J., Zhang, CM. et al. Parameter optimization in biased decoy-state quantum key distribution with both source errors and statistical fluctuations. Quantum Inf Process 16, 238 (2017). https://doi.org/10.1007/s11128-017-1687-7

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  • DOI: https://doi.org/10.1007/s11128-017-1687-7

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