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Security analysis of passive measurement-device-independent continuous-variable quantum key distribution with almost no public communication

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Abstract

We perform security analysis of a passive measurement-device-independent (MDI) continuous-variable quantum key distribution (CVQKD) protocol with almost no public communication. In the passive MDI-CVQKD protocol, the quantum states are prepared passively by using thermal sources without Gaussian modulations at Alice’s and Bob’s sides. With this technique, Alice and Bob can precisely prepare quantum states to match the high transmission rate in MDI-CVQKD system at the corresponding speed. Here, both asymptotic regime and finite-size regime are considered. In asymptotic case, we derive the security bounds for the protocol against collective attacks, while in finite-size case we show a new conceptual development of passive MDI-CVQKD, namely the final secret key generation can be performed by using almost all raw keys instead of sacrificing part of raw keys for parameter estimation, and thus the improvement performance of passive MDI-CVQKD protocol can be achieved in finite-size scenario.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China (Grant Nos. 61801522) and National Nature Science Foundation of Hunan Province, China (Grant No. 2019JJ40352).

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Authors and Affiliations

  1. School of Automation, Central South University, Changsha, 410083, China

    Xiaodong Wu, Yijun Wang & Ying Guo

  2. School of Computer Science and Engineering, Central South University, Changsha, 410083, China

    Sha Li, Wei Zhang & Duan Huang

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  1. Xiaodong Wu
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  2. Yijun Wang
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Correspondence to Duan Huang.

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Wu, X., Wang, Y., Li, S. et al. Security analysis of passive measurement-device-independent continuous-variable quantum key distribution with almost no public communication. Quantum Inf Process 18, 372 (2019). https://doi.org/10.1007/s11128-019-2486-0

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