Multi-user quantum cryptography networks

Summary form only given. Present quantum cryptography technologies can provide ultra-secure encryption key distribution between two parties. However, any practical implementation of encryption key distribution schemes requires establishing secure quantum communications amongst multiple users. In this talk, we briefly survey some of the latest quantum key distribution research going on in both industrial and academic research laboratories. In addition, recent efforts in deploying quantum cryptography technologies in the field are discussed. We also discuss some common topologies that are being considered for multi-user quantum encryption networks. The performance of the multi-user quantum key distribution systems is then compared in four common optical network topologies: the Sagnac-based fiber ring, the wavelength routed, the passive star and the bus network. Their performances are analyzed and compared using quantum bit error rate analysis.