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Chin. Phys., 2007, Vol. 16(8): 2149-2153    DOI: 10.1088/1009-1963/16/8/001
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Quantum secure direct communication with quantum encryption based on pure entangled states

Li Xi-Han, Li Chun-Yan, Deng Fu-Guo, Zhou Ping, Liang Yu-Jie, Zhou Hong-Yu
The Key Laboratory of Beam Technology and Material Modification of Ministry of Education, Beijing Normal University,Beijing 100875, China;Institute of Low Energy Nuclear Physics, and Department of Material Science and Engineering, Beijing Normal University,Beijing 100875, China;Beijing Radiation Center, Beijing 100875, China
Abstract  This paper presents a scheme for quantum secure direct communication with quantum encryption. The two authorized users use repeatedly a sequence of the pure entangled pairs (quantum key) shared for encrypting and decrypting the secret message carried by the travelling photons directly. For checking eavesdropping, the two parties perform the single-photon measurements on some decoy particles before each round. This scheme has the advantage that the pure entangled quantum signal source is feasible at present and any eavesdropper cannot steal the message.
Keywords:  quantum key      pure entangled states      quantum encryption      quantum secure direct communication  
Received:  07 November 2006      Revised:  21 November 2006      Published:  20 August 2007
PACS:  03.67.Hk (Quantum communication)  
  03.65.Ud (Entanglement and quantum nonlocality)  
  03.67.Dd (Quantum cryptography and communication security)  
  03.67.Mn (Entanglement measures, witnesses, and other characterizations)  
  42.50.Dv (Quantum state engineering and measurements)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos 10604008 and 10435020) and the Beijing Education Committee (Grant No XK100270454).

Cite this article: 

Li Xi-Han, Li Chun-Yan, Deng Fu-Guo, Zhou Ping, Liang Yu-Jie, Zhou Hong-Yu Quantum secure direct communication with quantum encryption based on pure entangled states 2007 Chin. Phys. 16 2149

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