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Chin. Phys. B, 2015, Vol. 24(2): 020304    DOI: 10.1088/1674-1056/24/2/020304
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Quantum communication for satellite-to-ground networks with partially entangled states

Chen Na, Quan Dong-Xiao, Pei Chang-Xing, Yang-Hong
State Key Laboratory of Integrated Services Networks, Xidian University, Xi'an 710071, China
Abstract  To realize practical wide-area quantum communication, a satellite-to-ground network with partially entangled states is developed in this paper. For efficiency and security reasons, the existing method of quantum communication in distributed wireless quantum networks with partially entangled states cannot be applied directly to the proposed quantum network. Based on this point, an efficient and secure quantum communication scheme with partially entangled states is presented. In our scheme, the source node performs teleportation only after an end-to-end entangled state has been established by entanglement swapping with partially entangled states. Thus, the security of quantum communication is guaranteed. The destination node recovers the transmitted quantum bit with the help of an auxiliary quantum bit and specially defined unitary matrices. Detailed calculations and simulation analyses show that the probability of successfully transferring a quantum bit in the presented scheme is high. In addition, the auxiliary quantum bit provides a heralded mechanism for successful communication. Based on the critical components that are presented in this article an efficient, secure, and practical wide-area quantum communication can be achieved.
Keywords:  satellite-to-ground quantum communication network      partially entangled states      entanglement swapping      quantum teleportation  
Received:  26 July 2014      Revised:  13 September 2014      Published:  05 February 2015
PACS:  03.67.Hk (Quantum communication)  
  42.50.Ex (Optical implementations of quantum information processing and transfer)  
Fund: Project supported by the National Natural Science Foundation of China (Grant Nos. 61072067 and 61372076), the 111 Project (Grant No. B08038), the Fund from the State Key Laboratory of Integrated Services Networks (Grant No. ISN 1001004), and the Fundamental Research Funds for the Central Universities (Grant Nos. K5051301059 and K5051201021).
Corresponding Authors:  Chen Na     E-mail:  na_chen@outlook.com

Cite this article: 

Chen Na, Quan Dong-Xiao, Pei Chang-Xing, Yang-Hong Quantum communication for satellite-to-ground networks with partially entangled states 2015 Chin. Phys. B 24 020304

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