Quantum communication for satellite-to-ground networks with partially entangled states

• 作者: 权东晓 杨宏 裴昌幸 陈娜
• 来源期刊: 中国物理B（英文版）
• 关键词: satellite-to-ground quantum communication network partially entangled states entanglement swapping quantum teleportation
• 年，卷（期）: 2015,（2）
• 页码范围: 020304-1-020304-9
• 页数: 1页
• 语种: 英文
• DOI: 10.1088/1674-1056/24/2/020304

摘要

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, security of quantum communication is guaranteed. The destination node recovers the transmitted quantum bit with the help of auxiliary quantum bit and specially defined unitary matrices. Detailed calculations and simulation analyses show that in the presented scheme, the probability of successfully transferring a quantum bit is high. In addition, the auxiliary quantum bit provides a heralded mechanism for successful communication. Based on these critical components presented in this article, an efficient, secure, and practical wide-area quantum communication can be achieved.