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High efficiency postprocessing for continuous-variable quantum key distribution: using all raw keys for parameter estimation and key extraction

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Abstract

High efficiency postprocessing of continuous-variable quantum key distribution (CV-QKD) system has a significant impact on the secret key rate and transmission distance of the system. For a quantum channel with unknown prior characteristics, we have to sacrifice part (typically half) of the raw keys to estimate the channel parameters, which is used to assist in error correction and estimate the secret key rate. This introduces a trade-off between the secret key rate and the accuracy of parameter estimation when considering the finite-size effect. In this paper, we propose a high efficiency postprocessing method which uses all the raw keys for both parameter estimation and key extraction. The correcting party uses the extra data (used for phase compensation and synchronization etc.) to roughly estimate the quantum channel parameters, or she can use the results of the last block, then she selects a suitable code to correct the errors between them, finally she recovers the raw keys of the other side by a reverse mapping function after the success of error correction. Then, she uses all the raw keys of both sides for parameter estimation. We show that this method improves the accuracy of parameter estimation and the secret key rate of CV-QKD system.

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Acknowledgements

This work was supported by the Key Program of National Natural Science Foundation of China under Grant 61531003, the National Natural Science Foundation under Grant 61427813, the National Basic Research Program of China (973 Program) under Grant 2014CB340102, the China Postdoctoral Science Foundation under Grant 2018M630116, and the Fund of State Key Laboratory of Information Photonics and Optical Communications.

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  1. Xiangyu Wang and Yichen Zhang have contributed equally to this work.

Authors and Affiliations

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

    Xiangyu Wang, Yichen Zhang & Song Yu

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

    Hong Guo

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  1. Xiangyu Wang
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  2. Yichen Zhang
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Correspondence to Song Yu.

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Wang, X., Zhang, Y., Yu, S. et al. High efficiency postprocessing for continuous-variable quantum key distribution: using all raw keys for parameter estimation and key extraction. Quantum Inf Process 18, 264 (2019). https://doi.org/10.1007/s11128-019-2381-8

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