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Performance analysis for OFDM-based multi-carrier continuous-variable quantum key distribution with an arbitrary modulation protocol

delete2023-01-31
delete6
delete
OA
AI
H
Heng Wang
Y
Yan Pan
Y
Yun Shao
Y
Yaodi Pi
T
Ting Ye
Y
Yang Li
张涛 cover
张涛 (Tao Zhang)
J
Jinlu Liu
J
Jie Yang
L
Li Ma
W
Wei Huang
B
Bingjie Xu *
DOI：10.1364/OE.482136delete
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Abstract

Abstract

En 中文
Multi-carrier continuous-variable quantum key distribution (CV-QKD) is considered to be a promising way to boost the secret key rate (SKR) over the existing single-carrier CV-QKD scheme. However, the extra excess noise induced in the imperfect multi-carrier quantum state preparation process of N subcarriers will limit the performance of the system. Here, a systematic modulation noise model is proposed for the multi-carrier CV-QKD based on the orthogonal frequency division multiplexing (OFDM). Subsequently, the performance of multi-carrier CV-QKD with arbitrary modulation protocol (e.g. QPSK, 256QAM and Gaussian modulation protocol) can be quantitatively evaluated by combining the security analysis method of the single-carrier CV-QKD. Under practical system parameters, the simulation results show that the SKR of the multi-carrier CV-QKD can still be significantly improved by increasing the carrier number N even with imperfect practical modulations. Specifically, the total SKR of multi-carrier CV-QKD can be optimized by carefully choosing N. The proposed model provides a feasible theoretical framework for the future multi-carrier CV-QKD experimental implementation.(c) 2023 Optica Publishing Group under the terms of the Optica Open Access Publishing Agreement

Journal

Optics Express cover
Optics Express
IF:
3.3
Papers:
6.1W
Citations:
14.3W

Organization

No organization information available