Phase compensation of continuous variable quantum key distribution based on mean denoising methods

Fu Lifeng; Jinlu Liu; Chenlin Zhang; Tao Zhang; Yun Shao; Bingjie Xu

doi:10.1117/12.2601338

9 October 2021 Phase compensation of continuous variable quantum key distribution based on mean denoising methods

Fu Lifeng, Jinlu Liu, Chenlin Zhang, Tao Zhang, Yun Shao, Bingjie Xu

Proceedings Volume 11905, Quantum and Nonlinear Optics VIII; 1190511 (2021) https://doi.org/10.1117/12.2601338
Event: SPIE/COS Photonics Asia, 2021, Nantong, JS, China

Conference Poster

Abstract

The phase compensation with high accuracy is one of the key technologies in continuous variable quantum key distribution (CVQKD) system, which directly influences the secure key rate and transmission distance. However, traditional phase compensation method cannot accurately estimate the phase drift due to the additive noise introduced by coherent detector. In this paper, we propose a new phase compensation method based on mean denoising, where a training sequence is designed for estimating phase drift in the transmitter (Alice) and an average of the multi-points in the training sequence is estimated to remove the influence of additive noise. Simulation results show that the compensation accuracy of the proposed method can reach 0.9932, which is 20% better than that based on traditional method. Our method can significantly reduce the influence of additive noise, and improve the system performance by controlling excess noise in phase compensation process.

Conference Presentation

Citation Download Citation

Fu Lifeng, Jinlu Liu, Chenlin Zhang, Tao Zhang, Yun Shao, and Bingjie Xu "Phase compensation of continuous variable quantum key distribution based on mean denoising methods", Proc. SPIE 11905, Quantum and Nonlinear Optics VIII, 1190511 (9 October 2021); https://doi.org/10.1117/12.2601338

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