Comment on "Improvement of Controlled Bidirectional Quantum Direct Communication Using a GHZ State" [Chin. Phys. Lett. 30 (2013) 040305]  

作　　者：LIU Zhi-Hao CHEN Han-Wu 刘志昊;陈汉武(School of Computer Science and Engineering,Southeast University,Nanjing 211189)

机构地区：[1]School of Computer Science and Engineering,Southeast University,Nanjing 211189

出　　处：《Chinese Physics Letters》2013年第7期258-258,共1页中国物理快报（英文版）

基　　金：Supported by the National Natural Science Foundation of China under Grant Nos 61170321 and 61103235;the Research Fund for the Doctoral Program of Higher Education under Grant No 20110092110024.

摘　　要：The problem of definite information leakage existing in the controlled bidirectional quantum direct communication protocol using GHZ states[Chin.Phys.Lett.23(2006)1680]was pointed out by Ye and Jiang[Chin.Phys.Lett.30(2013)040305].Then,they proposed two strategies to improve this security bug.However,if the revised versions are analyzed from the viewpoint of information theory,it can be found that they still have the problem of information leakage.That is,three quarters and one half of the information interchanged by the communication parties are leaked out unknowingly in the first and second revised protocols,respectively.

关 键 词：revised definite VIEWPOINT 

分 类 号：O41[理学—理论物理]