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Finite-key security analysis of the 1-decoy state QKD protocol with a leaky intensity modulator

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Abstract

The finite-key security of the standard three-intensity decoy-state quantum key distribution (QKD) protocol in the presence of information leakage has been analyzed (Wang et al. in New J Phys 20:083027, 2018). On the other hand, the 1-decoy state QKD protocol has been proved to be able to achieve higher secret key rate than the three-intensity decoy-state QKD protocol in the finite-key regime by using only two different intensity settings (Davide et al. in Appl Phys Lett 112:171104, 2018). In this work, we analyze the finite-key security of the 1-decoy state QKD protocol with a leaky intensity modulator, which is used to generate the decoy state. In particular, we simulate the secret key rate under three practical cases of Trojan-horse attacks. Our simulation results demonstrate that the 1-decoy state QKD protocol can be secure over long distances within a reasonable time frame given that the intensity modulator is sufficiently isolated. By comparing the simulation results to those presented in Wang et al. (2018), we find that, as expected, the 1-decoy state QKD protocol is more robust against information leakage from the intensity modulator for all achievable distances.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 61701539, 61972413, 61901525) and the National Cryptography Development Fund (mmjj20180107, mmjj20180212). WLW and XDM contributed equally to this work.

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Authors and Affiliations

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

    Weilong Wang, Xiangdong Meng, Yangyang Fei & Zhi Ma

  2. Henan Key Laboratory of Network Cryptography Technology, Zhengzhou, 450001, Henan, China

    Weilong Wang, Xiangdong Meng, Yangyang Fei & Zhi Ma

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  1. Weilong Wang
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  2. Xiangdong Meng
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  3. Yangyang Fei
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  4. Zhi Ma
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Correspondence to Weilong Wang.

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Wang, W., Meng, X., Fei, Y. et al. Finite-key security analysis of the 1-decoy state QKD protocol with a leaky intensity modulator. Quantum Inf Process 19, 196 (2020). https://doi.org/10.1007/s11128-020-02694-6

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  • DOI: https://doi.org/10.1007/s11128-020-02694-6

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