Multipartite continuous variable quantum communication with entanglement in the middle

作者：Zhang, Zhaoyuan; Shi, Ronghua; Guo, Ying^*

来源：Journal of Physics A-Mathematical and Theoretical, 2018, 51(29): 295301.

DOI：10.1088/1751-8121/aac8cf

• quantum key distribution
• continuous variable
• multipartite
• coherent attack

Multipartite quantum key distribution (QKD) is crucial for quantum communicating and may link massive private information to the complex quantum network protocols. In this paper, we tackle one of the difficulties in multipartite quantum communications by designing a quantum key distribution scheme with improved secret key rates. We suggest an entanglement-based tripartite continuous variable quantum key distribution (CVQKD) scheme for quantum network, where the source in the middle generates tripartite state and distributes the modes of the state to legitimate parties, respectively. We analyze the mutual information among the distributed modes of the tripartite state of protocols involving different attack strategies of the eavesdropper in varied circumstances. Numeric simulation results show that the CVQKD system enables the generations of secret keys against optimal coherent attacks.

• 出版日期2018-7-20
• 单位中南大学