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doi:10.1088/0256-307X/30/7/079901

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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.

收稿日期: 2013-04-09 出版日期: 2013-11-21

:	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)

引用本文:

. [J]. 中国物理快报, 2013, 30(7): 79901-079901.
LIU Zhi-Hao, CHEN Han-Wu. Comment on "Improvement of Controlled Bidirectional Quantum Direct Communication Using a GHZ State" [Chin. Phys. Lett. 30 (2013) 040305]. Chin. Phys. Lett., 2013, 30(7): 79901-079901.

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https://cpl.iphy.ac.cn/CN/10.1088/0256-307X/30/7/079901 或 https://cpl.iphy.ac.cn/CN/Y2013/V30/I7/79901

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