High-efficiency reconciliation for continuous variable quantum key distribution. (13th March 2017)

• Record Type: Journal Article
• Authors: Bai, Zengliang; Yang, Shenshen; Li, Yongmin
• Is Part Of: Japanese journal of applied physics. Volume 56:Number 4(2017)
• Publication Date: 2017-03-13
• Subjects: Physics -- Periodicals; 621.05
• DOI: 10.7567/JJAP.56.044401
• Languages: English
• ISSNs: 0021-4922

Abstract

Abstract: Quantum key distribution (QKD) is the most mature application of quantum information technology. Information reconciliation is a crucial step in QKD and significantly affects the final secret key rates shared between two legitimate parties. We analyze and compare various construction methods of low-density parity-check (LDPC) codes and design high-performance irregular LDPC codes with a block length of 10 6 . Starting from these good codes and exploiting the slice reconciliation technique based on multilevel coding and multistage decoding, we realize high-efficiency Gaussian key reconciliation with efficiency higher than 95% for signal-to-noise ratios above 1. Our demonstrated method can be readily applied in continuous variable QKD.