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Quantum Secure Direct Communication with Five-Qubit Entangled State |
| LIN Song1,2**, GAO Fei3, LIU Xiao-Fen1,2
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1School of Mathematics and Computer Science, Fujian Normal University, Fuzhou 350007
2Key Lab of Network Security and Cryptography, Fujian Normal University, Fuzhou 350007
3State Key Laboratory of Networking and Switching Technology, Beijing University of Posts and Telecommunications, Beijing 100876
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| Cite this article: |
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LIN Song, GAO Fei, LIU Xiao-Fen 2011 Chin. Phys. Lett. 28 030302 |
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Abstract Recently, a genuine five-qubit entangled state has been achieved by Brown et al. [J. Phys. A 38 (2005) 1119]. Later it was indicated that this state can be used for quantum teleportation and quantum state sharing. Here we build a quantum secure direct communication protocol with this state, and prove that it is secure in ideal conditions. In the protocol, the sender performs unitary transformations to encode a secret message on his/her particles and sends them to the receiver. The receiver then performs projective determinate measurement to decode the secret message directly. Furthermore, this protocol utilizes superdense coding to achieve a high intrinsic efficiency and source capacity.
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| Keywords:
03.67.Dd
03.67.Hk
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Received: 22 November 2010
Published: 28 February 2011
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| PACS: |
03.67.Dd
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(Quantum cryptography and communication security)
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03.67.Hk
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(Quantum communication)
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