Efficient rate-adaptive reconciliation for CV-QKD protocol
(pp1123-1134)
Xiangyu Wang, Yichen Zhang, Zhengyu Li, Bingjie Xu, Song Yu,
and Hong Guo
doi:
https://doi.org/10.26421/QIC17.13-14-4
Abstracts:
Information reconciliation protocol has a significant
effect on the secret key rate and maximal transmission distance of
continuous-variable quantum key distribution (CVQKD) 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.
Key words:
Continuous-variable quantum key distribution,
rate-adaptive reconciliation, time-varying channel, reconciliation
efficiency, multi-edge type low density parity check codes, puncturing
and shortening techniques |