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基于六光子量子避错码的量子密钥分发方案
引用本文:刘文予,李宁,王长强,刘玉.基于六光子量子避错码的量子密钥分发方案[J].光学学报,2005,25(11):568-1572.
作者姓名:刘文予  李宁  王长强  刘玉
作者单位:华中科技大学,电子与信息工程系,武汉,430074
基金项目:湖北省自然科学基金(2003ABA008)资助蝶题.
摘    要:量子信道中不可避免存在的噪声将扭曲被传输的信息,对通信造成危害。目前克服量子信道噪声的较好方案是量子避错码(QEAC)。将量子避错码思想用于量子密钥分发,能有效克服信道中的噪声,且无需复杂的系统。用六光子构造了量子避错码,提出了一种丛于六光子避错码的量子密钥分发(QDK)方案。以提高量子密钥分发的量子比特效率和安全性为前提,对六光子避错码的所有可能态进行组合,得到一种六光子避错码的最优组合方法,可将两比特信息编码在一个态中,根据测肇结果和分组信息进行解码,得到正确信息的平均概率为7/16。与最近的基于四光子避错码的克服量子信道噪声的量子密钥分发方案相比,该方案的量子比特效率提高了16.67%,密钥分发安全性足它的3.5倍。

关 键 词:量子光学  量子信息  量子密钥分发  量子避错码  量子纠缠
文章编号:0253-2239(2005)11-1568-5
收稿时间:2004-12-17
修稿时间:2005-04-05

Quantum Key Distribution Based on Six-Photon Quantum Error-Avoiding Code
Liu Wenyu,Li Ning,Wang Changqiang,Liu Yu.Quantum Key Distribution Based on Six-Photon Quantum Error-Avoiding Code[J].Acta Optica Sinica,2005,25(11):568-1572.
Authors:Liu Wenyu  Li Ning  Wang Changqiang  Liu Yu
Institution:Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan 430074
Abstract:Noise that unavoidably exists in the quantum channel will distort transmitted information and destroy the communication.The superior scheme to overcome the noise at present is quantum error-avoiding code QEAC.The quantum key distribution QKD using the QEAC will be robust in the quantum noisy channel without complex system.Six-photon error-avoiding code SPEAC is constituted and a robust QKD scheme based on it is proposed.In order to improve the qubit efficiency and the security of QKD,all the possible quantum states in the SPEAC are assembled,and as a result,an optimal scheme is developed,by which two key bits can be encoded in each state and Bob can decode the information successfully with an average probability of 7/16.Compared with the recent QKD scheme based on four-photon QEAC,the qubit efficiency of the authors' scheme increases by 16.67%,and the security is 3.5 times of it.
Keywords:quantum optics  quantum information  quantum key distribution  quantum error-avoiding code  quantum entanglement
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