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A hierarchical metropolitan quantum cryptography network upon the inner-city commercial telecom fiber cables is reported in this paper. The techniques of the quantum router, optical switch and trusted relay are assembled here to divide the seven-user network into a four-node backbone net, a two-user subnet and a single-fiber access link. Secure keys distributed in this network can be utilized to encrypt...
Quantum key distribution (QKD) networks have recently attracted growing attention. The topology of the local QKD network is the basis of the next-generation global secure communication network. In this letter, we report a realization of a wavelength-routing star type QKD network which can span a metropolis using a commercial backbone optical fiber network without trusted relays. The longest and the...
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