In:
Quantum Information and Computation, Rinton Press, Vol. 17, No. 13&14 ( 2017-11), p. 1123-1134
Abstract:
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.
Type of Medium:
Online Resource
ISSN:
1533-7146
,
1533-7146
DOI:
10.26421/QIC17.13-14
DOI:
10.26421/QIC17.13-14-4
Language:
Unknown
Publisher:
Rinton Press
Publication Date:
2017
SSG:
24,1
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