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Efficient error estimation in quantum key distribution

Chinese Physics B 2015年第1期24卷 153-156页

作者：李默 patcharapong treeviriyanupab 张春梅银振强陈巍韩正甫 Key Laboratory of Quantum Information Chinese Academy of Sciences University of Science and Technology of China Synergetic Innovation Center of Quantum Information & Quantum Physics University of Science and Technology of China Department of Computer Science Faculty of Science and Technology Phranakhon Rajabhat UniversityBangkok Thailand

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

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Fast implementation of length-adaptive privacy amplification in quantum key distribution

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Chinese Physics B 2014年第9期23卷 112-117页

作者：张春梅李默黄靖正 patcharapong treeviriyanupab 李宏伟李芳毅王川银振强陈巍 Keattisak Sripimanwat 韩正甫 Key Laboratory of Quantum Information Chinese Academy of Sciences University of Science and Technology of China Optical and Quantum Communications (OQC) Laboratory National Electronics and Computer Technology Center (NECTEC)National Science and Technology Development Agency (NSTDA)

Post-processing is indispensable in quantum key distribution （QKD）, which is aimed at sharing secret keys between two distant parties. It mainly consists of key reconciliation and privacy amplification, which is used for sharing the same keys and for distilling unconditional secret keys. In this paper, we focus on speeding up the privacy amplification process by choosing a simple multiplicative universal class of hash functions. By constructing an optimal multiplication algorithm based on four basic multiplication algorithms, we give a fast software implementation of length-adaptive privacy amplification. ＂Length-adaptive＂ indicates that the implementation of privacy amplification automatically adapts to different lengths of input blocks. When the lengths of the input blocks are 1 Mbit and 10 Mbit, the speed of privacy amplification can be as fast as 14.86 Mbps and 10.88 Mbps, respectively. Thus, it is practical for GHz or even higher repetition frequency QKD systems.

关键词： length-adaptive privacy amplification multiplication algorithms quantum key distribution

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Delayed error verification in quantum key distribution

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Chinese Science Bulletin 2014年第23期59卷 2825-2828页

作者： Chun-Mei Zhang Xiao-Tian Song patcharapong treeviriyanupab Mo Li Chao Wang Hong-Wei Li Zhen-Qiang Yin Wei Chen Zheng-Fu Han Key Laboratory of Quantum Information CASUniversity of Science and Technology of China Synergetic Innovation Center of Quantum Information and Quantum Physics University of Science and Technology of China Department of Computer Science Faculty of Science and TechnologyPhranakhon Rajabhat University

Quantum key distribution(QKD)provides an unconditional secure key generation method between two distant legitimate parties Alice and Bob based on the fundamental properties of quantum mechanics,in the presence of an eavesdropper *** key reconciliation cannot always assure that the reconciled keys between Alice and Bob are identical,error verification is an important step in *** this paper,we propose a scheme of delayed error verification using extra keys gained by privacy amplification with an arbitrarily small failure *** proposed scheme simplifies the post-processing procedure in QKD,which can be applied in practical QKD systems.

关键词：量子密钥分配误差检定延迟量子密钥分发无条件安全生成方法量子力学误差校验

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