Chin. Phys. Lett.  2013, Vol. 30 Issue (7): 079901    DOI: 10.1088/0256-307X/30/7/079901
COMMENTS AND ERRATA |
Comment on "Improvement of Controlled Bidirectional Quantum Direct Communication Using a GHZ State" [Chin. Phys. Lett. 30 (2013) 040305]
LIU Zhi-Hao, CHEN Han-Wu**
School of Computer Science and Engineering, Southeast University, Nanjing 211189
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LIU Zhi-Hao, CHEN Han-Wu 2013 Chin. Phys. Lett. 30 079901
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Abstract 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.
Received: 09 April 2013      Published: 21 November 2013
PACS:  99.10.-x (Errata and other corrections)  
  03.67.Hk (Quantum communication)  
  03.67.Dd (Quantum cryptography and communication security)  
  03.67.Ac (Quantum algorithms, protocols, and simulations)  
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http://cpl.iphy.ac.cn/10.1088/0256-307X/30/7/079901       OR      http://cpl.iphy.ac.cn/Y2013/V30/I7/079901
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LIU Zhi-Hao
CHEN Han-Wu
[1] Ye T Y and Jiang L Z 2013 Chin. Phys. Lett. 30 040305
[2] Man Z X and Xia Y J 2006 Chin. Phys. Lett. 23 1680
[3] Shannon C E 1948 Bell Syst. Tech. J. 27 623
[4] Gao F, Guo F Z, Wen Q Y and Zhu F C 2008 Sci. Chin. Ser. G-Phys. Mech. Astron. 51 559
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