Abstract

Continuous-variable quantum key distribution (CVQKD) over an atmosphere channel provides the possibility of global coverage, which is threatened by the imperfection of actual devices. Exploiting imperfections of practical devices, an eavesdropper steals the information between legal participants by performing the potential saturation-induced attacks on the homodyne detector. In this paper, we demonstrate the feasibility of the potential saturation attack in discretely modulated (DM) CVQKD over atmospheric turbulence. Subsequently, a countermeasure is suggested by using an adjustable optical filter (AOF) to attenuate the estimated parameter with the measured value in the finite linearity domain, where the attenuated data can be compensated. Numerical simulations illustrate the effects of the saturation attack on the performance of the AOF-based CVQKD system. We find that legal participants evaluate the information that has been eavesdropped because the secret key rate is made negative.

© 2022 Optica Publishing Group

Wavelength attack recognition based on machine learning optical spectrum analysis for the practical continuous-variable quantum key distribution system

Zhe He, Yijun Wang, and Duan Huang
J. Opt. Soc. Am. B 37(6) 1689-1697 (2020)

Reference pulse attack on continuous variable quantum key distribution with local local oscillator under trusted phase noise

Shengjun Ren, Rupesh Kumar, Adrian Wonfor, Xinke Tang, Richard Penty, and Ian White
J. Opt. Soc. Am. B 36(3) B7-B15 (2019)

Security analysis of practical continuous-variable quantum key distribution systems under laser seeding attack

Yi Zheng, Peng Huang, Anqi Huang, Jinye Peng, and Guihua Zeng
Opt. Express 27(19) 27369-27384 (2019)

Dual-phase-modulated plug-and-play measurement-device-independent continuous-variable quantum key distribution

Qin Liao, Yijun Wang, Duan Huang, and Ying Guo
Opt. Express 26(16) 19907-19920 (2018)

Sifting scheme for continuous-variable quantum key distribution with short samples

Zijie Wu, Yijun Wang, Ling Zhang, Yiyu Mao, Haisen Luo, Ying Guo, and Duan Huang
J. Opt. Soc. Am. B 39(3) 694-704 (2022)