Revisiting Controlled Quantum Secure Direct Communication Using a Non-symmetric Quantum Channel with Quantum Superdense Coding |
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| Authors: | LIU Jun LIU Yi-Min XIA Yan ZHANG Zhan-Jun |
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| Affiliation: | 1. Key Laboratory of Optoelectronic InformationAcquisition & Manipulation of Ministry of Education of China, School of Physics & Material Science, Anhui University, Hefei 230039, China;2. Department of Physics, Shaoguan University, Shaoguan 512005, China;3. School of Physic and Optoelectronic, Dalian University of Technology, Dalian 116024, China |
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| Abstract: | ![]()
Recently Xia and Song [Phys. Lett. A 364 (2007) 117]have proposed a controlled quantum secure direct communication(CQSDC) protocol. They claimed that in their protocol only with thehelp of the controller Charlie, the receiver Alice can successfullyextract the secret message from the sender Bob. In this letter,first we will show that within their protocol the controllerCharlie's role could have been excluded if it were not for their unreasonable design. Wethen revise the Xia-Song CQSDC protocol such that its originaladvantages are retained and the CQSDC can be really realized. |
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| Keywords: | quantum secure direct communication quantum superdense coding non-symmetric quantumchannel |
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