Summary
International Technical Conference on Circuits/Systems, Computers and Communications
2016
Session Number:W2-4
Session:
Number:W2-4-3
Rate-Adaptive LDPC Reconciliation and Estimation in Quantum Key Distribution
Pisit Vanichchanunt, Tharathorn Phromsa-ard, Patcharapong Treeviriyanupub, Paramin Sangwongngam, Lunchakorn Wuttisittikulkij ,
pp.815-818
Publication Date:2016/7/10
Online ISSN:2188-5079
Summary:
The key reconciliation method is proposed as one of the classical parts in Quantum Key Distribution (QKD) protocol. The proposed method aims to correct the transmission error after distribution of quantum key objects over a quantum channel. For error correction, Low-Density Parity-Check (LDPC) codes are adopted as the technique of source coding with side information or the Slepian-Wolf coding. In this work, rate adaptive LDPC reconciliation method based on puncturing and shortening technique with estimated Quantum Bit Error Rate (QBER) from only syndrome is studied. Its objective is to skip the step of quantum bit error rate (QBER) estimation by the traditional key sampling that increases the final secret key length in practice. This method also estimates reconciliation efficiency in advance for determination of an optimal rate that reduces the interactive communication. From numerical results, it can be observed that the performance of our proposed schemes in terms of reconciliation efficiency and secret key throughput is superior to conventional Cascade, and fixed-rate compatible LDPC based protocols. Therefore, gain of these proposed schemes is suitable for the high-speed discrete-variable QKD applications.