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Revisiting Quantum Secure Direct Communication with W State
作者姓名:刘俊  刘益民  曹海静  史守华  张战军
作者单位:[1]Key Laboratory of Optoelectronic Information Acquisition and Manipulation of Ministry of Education of China, School of Physics and Material Science, Anhui University, Hefei 230039 [2]Department of Physics, Shaoguan University, Shaoguan 512005 [3]The State Key Laboratory of Magnetic Resonance and Atomic and Molecular Physics, Wuhan Institute of Physics and Mathematics, Chinese Academy of Sciences, Wuhan 430071 [4]Department of Physics, Dalian University of Technology, Dalian 116024
摘    要:The quantum secure direct communication protocol recently proposed by Cao and Song Chin. Phys. Left. 23 (2006)290] (i.e., the C-S QSDC protocol) is revisited. A security leak is pointed out. Taking advantage of this leak, an eavesdropper may adopt the intercept-measure-resend strategy to attack the quantum channel such that in the C-S QSDC protocol the secret message can be completely eavesdropped. To fix the leak, the original version of the C-S QSDC protocol is revised. As a consequence, the security is improved and assured at least in the case of an ideal quantum channel.

关 键 词:量子加密直接通信  W态  通信协议  量子信道
收稿时间:2006-05-08
修稿时间:2006-05-08

Revisiting Quantum Secure Direct Communication with W State
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