Affiliation:
1. Institute of Southwestern Communication
Abstract
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.
Funder
National Key Research and Development Program of China
Sichuan Science and Technology Program
National Natural Science Foundation of China
Technology Innovation and Development Foundation of China Cyber Security
Chengdu Major Science and Technology Innovation Program
Chengdu Key Research and Development Support Program
Foundation of Science and Technology on Communication Security Laboratory
Major Project of the Department of Science and Technology of Sichuan
Subject
Atomic and Molecular Physics, and Optics
Cited by
3 articles.
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