A method to eliminate the influence of statistical fluctuation on the source parameters for quantum key distribution

Abstract

Abstract: In the real quantum key distribution (QKD) system, statistical fluctuation on the source parameters will happen with the changes of time and environment, which causes a serve decrease of the key rate. In this paper, we propose a method to eliminate the influence of statistical fluctuation on the source parameters for QKD. The method can use heralded coherent sources to replace the widely used weak coherent sources, which can significantly improve key rate of QKD with statistical fluctuation on the source parameters and thus eliminate the influence of statistical fluctuation on the source parameters. In addition, the maximum transmission distance is also significantly improved. Both the theoretical analysis and numerical simulation verify the feasibility of the method. The method can provide a way to the practical application of QKD.

Key words: quantum optics, quantum key distribution, heralded coherent source, source fluctuation, secure key

CLC Number:

O431.2

SHA Yitian, FENG Bao, JIA Wei, LI Wei. A method to eliminate the influence of statistical fluctuation on the source parameters for quantum key distribution[J]. Chinese Journal of Quantum Electronics, 2020, 37(1): 57-62.

References

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