Monitoring the source noise of a plug-and-play continuous variable quantum key distribution system

Yun Shao; Yan Pan; Heng Wang; Yaodi Pi; Ting Ye; Jinlu Liu; Yang Li; Wei Huang; Bingjie Xu

doi:10.1117/12.2687113

26 November 2023 Monitoring the source noise of a plug-and-play continuous variable quantum key distribution system

Yun Shao, Yan Pan, Heng Wang, Yaodi Pi, Ting Ye, Jinlu Liu, Yang Li, Wei Huang, Bingjie Xu

Proceedings Volume 12775, Quantum and Nonlinear Optics X; 1277519 (2023) https://doi.org/10.1117/12.2687113
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

The source noise in plug-and-play continuous variable quantum key distribution (CV-QKD) system plays a crucial role in determining the secret key rate and transmission distance. In general, the source noise is considered untrusted and fully controlled by Eve, which is because the laser travels through the unsecure channel before being modulated. However, this may overestimate the key information stolen by Eve leading to an underestimation of the key rate share between the legal communication parties. Here, we use a beam-splitter with signal attenuation to model the source noise combined with source monitoring scheme to characterize the source imperfection in the plug-and-play CV-QKD system. We show that the performance of the plug-and-play CV-QKD can be significantly improved under the above scheme compared to the untrusted source model. Our numerical simulation results also show that the plug-and-play CV-QKD with source monitoring has a key generation rate close to that of a trusted source under the same simulation parameters.

(2023) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

Yun Shao, Yan Pan, Heng Wang, Yaodi Pi, Ting Ye, Jinlu Liu, Yang Li, Wei Huang, and Bingjie Xu "Monitoring the source noise of a plug-and-play continuous variable quantum key distribution system", Proc. SPIE 12775, Quantum and Nonlinear Optics X, 1277519 (26 November 2023); https://doi.org/10.1117/12.2687113

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