Efficient rate-adaptive reconciliation for continuous-variable quantum key distribution
Abstract
Information reconciliation protocol has a significant effect on the secret key rate and maximal transmission distance of continuous-variable quantum key distribution (CV-QKD) systems. We propose an efficient rate-adaptive reconciliation protocol suitable for practical CV-QKD systems with time-varying quantum channel. This protocol changes the code rate of multi-edge type low density parity check codes, by puncturing (increasing the code rate) and shortening (decreasing the code rate) techniques, to enlarge the correctable signal-to-noise ratios regime, thus improves the overall reconciliation efficiency comparing to the original fixed rate reconciliation protocol. We verify our rate-adaptive reconciliation protocol with three typical code rate, i.e., 0.1, 0.05 and 0.02, the reconciliation efficiency keep around 93.5%, 95.4% and 96.4% for different signal-to-noise ratios, which shows the potential of implementing high-performance CV-QKD systems using single code rate matrix.
Cite
@article{arxiv.1703.04916,
title = {Efficient rate-adaptive reconciliation for continuous-variable quantum key distribution},
author = {Xiangyu Wang and Yi-Chen Zhang and Zhengyu Li and Bingjie Xu and Song Yu and Hong Guo},
journal= {arXiv preprint arXiv:1703.04916},
year = {2018}
}
Comments
12 pages, 5 figures