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Application of practical noiseless linear amplifier in no-switching continuous-variable quantum cryptography

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Abstract

We propose a modified no-switching continuous-variable quantum key distribution protocol by employing a practical noiseless linear amplifier at the receiver to increase the maximal transmission distance and tolerable excess noise. A security analysis is presented to derive the secure bound of the protocol in presence of a Gaussian noisy lossy channel. Simulation results show that the modified protocol can not only transmit longer distance and tolerate more channel excess noise than the original protocol, but also distribute more secure keys in the enhanced region where we define a critical point to separate the enhanced and degenerative region. This critical point presents the condition of using a practical noiseless linear amplifier in the no-switching continuous-variable quantum cryptography, which is meaningful and instructive to implement a practical experiment.

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Acknowledgments

This work was supported in part by the National Basic Research Program of China (973 Pro-gram) under Grant 2012CB3156052, in part by the National Science Fund for Distinguished Young Scholars of China (Grant No. 61225003), in part by the State Key Program of National Natural Science of China (Grant No. 61531003), in part by the Fund of State Key Laboratory of Information Photonics and Optical Communications, and in part by the Fundamental Research Funds for the Central Universities.

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Authors and Affiliations

  1. State Key Laboratory of Information Photonics and Optical Communications, Beijing University of Posts and Telecommunications, Beijing, 100876, China

    Yichen Zhang, Song Yu & Hong Guo

  2. State Key Laboratory of Advanced Optical Communication Systems and Networks, School of Electronics Engineering and Computer Science, Center for Computational Science and Engineering and Center for Quantum Information Technology, Peking University, Beijing, 100871, China

    Hong Guo

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  1. Yichen Zhang
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Correspondence to Yichen Zhang.

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Zhang, Y., Yu, S. & Guo, H. Application of practical noiseless linear amplifier in no-switching continuous-variable quantum cryptography. Quantum Inf Process 14, 4339–4349 (2015). https://doi.org/10.1007/s11128-015-1095-9

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