Experimental implementation of B92 Quantum key distribution protocol

Quantum key distribution is a technique that permits the secure distribution of a bit string, used as key in cryptographic protocols. The security is guaranteed by suitable coding of the information in a quantum property and from the fact that a quantum cannot be both split and cloned. In this paper, we give details and show the results of an experimental realization of the B92 quantum key distribution protocol in 1550 nm telecom window.