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Practical decoy state quantum key distribution with detector efficiency mismatch

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Abstract

Decoy state method is widely used in practical quantum key distribution (QKD) systems to substantially extend the secure communication distance. Detector efficiency mismatch (DEM), which exists between practical detectors, effects the security of practical QKD systems seriously. Security of single photon QKD with DEM has been analyzed. However, estimate of the phase error rate still remains difficult in practice. Here, using a simple equivalent detection model, the mutual information between legitimate users and the eavesdropper for single photon state in QKD with DEM is analyzed. Then we improve the security analysis to cover the situation of weak coherent QKD with DEM. A general theory of the decoy state QKD with DEM is proposed to calculate the lower bound of count rate and the upper bound of error rate of single photon state signals. The numerical simulations show that secure key can also be generated, but the existing of DEM will reduce the secure key of practical decoy state QKD systems. The experiment parameter related security bound of DEM is also given out.

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Authors and Affiliations

  1. State Key Laboratory of Mathematical Engineering and Advanced Computing, Zhengzhou, Henan, 450001, P.R. China

    Yang-yang Fei, Xiang-dong Meng, Ming Gao, Zhi Ma & Hong Wang

  2. CAS Center for Excellence and Synergetic Innovation Center in Quantum Information and Quantum Physics, University of Science and Technology of China, Hefei, Anhui, 230026, P.R. China

    Zhi Ma

Authors
  1. Yang-yang Fei
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  2. Xiang-dong Meng
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  3. Ming Gao
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  4. Zhi Ma
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  5. Hong Wang
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Correspondence to Yang-yang Fei or Ming Gao.

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Fei, Yy., Meng, Xd., Gao, M. et al. Practical decoy state quantum key distribution with detector efficiency mismatch. Eur. Phys. J. D 72, 107 (2018). https://doi.org/10.1140/epjd/e2018-90110-3

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  • DOI: https://doi.org/10.1140/epjd/e2018-90110-3

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