Implementation of a 46-node quantum metropolitan area network

Abstract Quantum key distribution (QKD) enables secure exchanges between two remote users. The ultimate goal of communication is to establish a global quantum network. existing field tests suggest that networks are feasible. To achieve practical network, we need overcome several challenges including realizing versatile topologies for large scales, simple network maintenance, extendable configuration and robustness node failures. this end, present operation metropolitan-area with 46 nodes show all these can be cutting-edge technologies. In particular, realize different topological structures continuously run the 31 months, by employing standard equipment maintenance an configuration. We QKD pairing management sophisticated control centre. implementation, final keys have been used such as real-time voice telephone, text messaging file transmission one-time pad encryption, which support 11 pairs users make audio calls simultaneously. Combined intercity backbone ground–satellite links, our metropolitan implementation paves way toward