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Unidimensional continuous-variable quantum key distribution with noisy source

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Abstract

We investigate the security of unidimensional continuous-variable quantum key distribution with source noise at the sender. The source noise is ascribed to the legitimate sides rather than the eavesdropper and modeled as a thermal noise coupled with the signal mode through a beam splitter. The physicality bound and expressions of secret key rate are derived against collective entangling cloner attacks. Simulation results show that with source noise, the security bound of unidimensional protocol can be tightened. Moreover, proper source noise enlarges the security region to a wider range of parameters, thus eliminates potential eavesdropping threats and enhances the feasibility of unidimensional protocol.

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Acknowledgements

The work is supported in part by the Natural Science Foundation of China (No. 61865002), in part by the Major Project of Guizhou Province (No. [2016]3022), in part by the Science & Technology Cooperation Project of Guizhou Province (No. [2014]7002, No. [2016]7431) and in part by the Scientific Research Foundation for Talent Introduced in Guizhou University (No. [2015]45).

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Authors and Affiliations

  1. College of Big Data and Information Engineering, Guizhou University, Guiyang, China

    Tianyi Wang, Lun Li, Xu Wang, Anjiang Lu, Damin Zhang & Zhengping Zhang

  2. Tianjin Key Laboratory of Wireless Mobile Communications and Power Transmission, Tianjin Normal University, Tianjin, China

    Ming Li

  3. College of Electronic and Communication Engineering, Tianjin Normal University, Tianjin, China

    Ming Li

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  1. Tianyi Wang
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  2. Lun Li
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  4. Xu Wang
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Correspondence to Damin Zhang.

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Wang, T., Li, L., Li, M. et al. Unidimensional continuous-variable quantum key distribution with noisy source. Quantum Inf Process 19, 3 (2020). https://doi.org/10.1007/s11128-019-2495-z

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