A new scheme for orthogonal dual-polarization continuous-variable quantum key distribution

Shuai Zhang; Yan Pan; Heng Wang; Yun Shao; Tao Zhang; Jinlu Liu; Yaodi Pi; Wei Huang; Yang Li; Bingjie Xu

doi:10.1117/12.2687116

26 November 2023 A new scheme for orthogonal dual-polarization continuous-variable quantum key distribution

Shuai Zhang, Yan Pan, Heng Wang, Yun Shao, Tao Zhang, Jinlu Liu, Yaodi Pi, Wei Huang, Yang Li, Bingjie Xu

Proceedings Volume 12775, Quantum and Nonlinear Optics X; 127751A (2023) https://doi.org/10.1117/12.2687116
Event: SPIE/COS Photonics Asia, 2023, Beijing, China

Conference Poster

Abstract

In this article, we propose a pilot alternately assisted scheme of orthogonal dual-polarization and time multiplexing for the local local oscillator continuous-variable quantum key distribution (LLO CV-QKD). Our scheme utilizes time multiplexing and dual-polarization multiplexing techniques to dramatically isolate the quantum signal from the pilot light. To analyze the influence mechanism of time-domain diffusion and polarization perturbation on the key parameters, such as the channel transmittance and excess noise, of the studied system, a general LLO excess noise model based on polarization extinction ratio (PER) and time-domain pulse extinction ratio (TER) is established. We mainly focus on the photon-leakage noise from the reference path to the quantum signal path, which is first analyzed in the dual polarization LLO regime. Furthermore, we conduct a series of simulations to verify the proposed dual polarization and time multiplexing model. Results show that it maintains a low level of excess noise and a secure key rate (SKR) of 10.25 Mbps@25km can be obtained under the finite-size effect. We achieved 0.93Mbps@25km SKR under a relatively low PER of 17 dB in the nanosecond level pulse width. Our work greatly extends the application scenarios of the dual-polarization division multiplexing CV-QKD system and provides a theoretical and representative framework for the study of improving the performance of the dual-polarization CV-QKD system.

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

Citation Download Citation

Shuai Zhang, Yan Pan, Heng Wang, Yun Shao, Tao Zhang, Jinlu Liu, Yaodi Pi, Wei Huang, Yang Li, and Bingjie Xu "A new scheme for orthogonal dual-polarization continuous-variable quantum key distribution", Proc. SPIE 12775, Quantum and Nonlinear Optics X, 127751A (26 November 2023); https://doi.org/10.1117/12.2687116

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