Network-topology-adaptive quantum conference protocols

• Published in: Chinese physics B 2011-08, Vol.20 (8), p.51-56
• Main Authors: Zhang, Sheng, Wang, Jian, Tang, Chao-Jing, Zhang, Quan
• Format: Article
• Language: English
• Subjects: Channels; Conferences; Data compression; Encryption; Equivalence; Networks; Protocol (computers); Topology; 保密通信; 协议; 多方会议; 拓扑结构; 网络拓扑; 自适应; 量子密钥分配; 量子网络
• ISSN: 1674-1056; 2058-3834
• DOI: 10.1088/1674-1056/20/8/080306

As an important application of the quantum network communication, quantum multiparty conference has made multiparty secret communication possible. Previous quantum multiparty conference schemes based on quantum data encryption are insensitive to network topology. However, the topology of the quantum network significantly affects the communication efficiency, e.g., parallel transmission in a channel with limited bandwidth. We have proposed two distinctive protocols, which work in two basic network topologies with efficiency higher than the existing ones. We first present a protocol which works in the reticulate network using Greeberger-Horne-Zeilinger states and entanglement swapping. Another protocol, based on quantum multicasting with quantum data compression, which can improve the efficiency of the network, works in the star-like network. The security of our protocols is guaranteed by quantum key distribution and one-time-pa~t eucryption. In general, the two protocols can be applied to any quantum network where the topology can be equivalently transformed to one of the two structures we propose in our protocols.