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Improvement of two-way continuous-variable quantum key distribution with virtual photon subtraction

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Abstract

We propose a method to improve the performance of two-way continuous-variable quantum key distribution protocol by virtual photon subtraction. The virtual photon subtraction implemented via non-Gaussian post-selection not only enhances the entanglement of two-mode squeezed vacuum state but also has advantages in simplifying physical operation and promoting efficiency. In two-way protocol, virtual photon subtraction could be applied on two sources independently. Numerical simulations show that the optimal performance of renovated two-way protocol is obtained with photon subtraction only used by Alice. The transmission distance and tolerable excess noise are improved by using the virtual photon subtraction with appropriate parameters. Moreover, the tolerable excess noise maintains a high value with the increase in distance so that the robustness of two-way continuous-variable quantum key distribution system is significantly improved, especially at long transmission distance.

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Acknowledgements

This work was supported in part by the National Basic Research Program of China (973 Program) under Grant 2014CB340102, in part by the National Natural Science Foundation under Grants 61225003, 61531003, 61427813, 61401036, 61471051.

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Authors and Affiliations

  1. State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Yijia Zhao, Yichen Zhang & Song Yu

  2. State Key Laboratory of Advanced Optical Communication Systems and Networks, Center for Computational Science and Engineering and Center for Quantum Information Technology, School of Electronics Engineering and Computer Science, Peking University, Beijing, 100871, China

    Zhengyu Li & Hong Guo

Authors
  1. Yijia Zhao
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  2. Yichen Zhang
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  3. Zhengyu Li
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  4. Song Yu
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  5. Hong Guo
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Correspondence to Song Yu.

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Zhao, Y., Zhang, Y., Li, Z. et al. Improvement of two-way continuous-variable quantum key distribution with virtual photon subtraction. Quantum Inf Process 16, 184 (2017). https://doi.org/10.1007/s11128-017-1617-8

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  • DOI: https://doi.org/10.1007/s11128-017-1617-8

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