Efficient error estimation in quantum key distribution  

作　　者：李默 Patcharapong Treeviriyanupab 张春梅 银振强 陈巍 韩正甫 

机构地区：[1]Key Laboratory of Quantum Information, Chinese Academy of Sciences, University of Science and Technology of China [2]Synergetic Innovation Center of Quantum Information & Quantum Physics, University of Science and Technology of China [3]Department of Computer Science, Faculty of Science and Technology, Phranakhon Rajabhat University,Bangkok, Thailand

出　　处：《Chinese Physics B》2015年第1期153-156,共4页中国物理B（英文版）

基　　金：Project supported by the National Basic Research Program of China(Grant Nos.2011CBA00200 and 2011CB921200);the National Natural Science Foundation of China(Grant Nos.61101137,61201239,and 61205118)

摘　　要：In a quantum key distribution（QKD） system, the error rate needs to be estimated for determining the joint probability distribution between legitimate parties, and for improving the performance of key reconciliation. We propose an efficient error estimation scheme for QKD, which is called parity comparison method（PCM）. In the proposed method, the parity of a group of sifted keys is practically analysed to estimate the quantum bit error rate instead of using the traditional key sampling. From the simulation results, the proposed method evidently improves the accuracy and decreases revealed information in most realistic application situations.In a quantum key distribution（QKD） system, the error rate needs to be estimated for determining the joint probability distribution between legitimate parties, and for improving the performance of key reconciliation. We propose an efficient error estimation scheme for QKD, which is called parity comparison method（PCM）. In the proposed method, the parity of a group of sifted keys is practically analysed to estimate the quantum bit error rate instead of using the traditional key sampling. From the simulation results, the proposed method evidently improves the accuracy and decreases revealed information in most realistic application situations.

关 键 词：error estimation parity comparison quantum key distribution 

分 类 号：O413[理学—理论物理] TN918.4[理学—物理]