Method and system utilizing quantum authentication

Abstract

A system and a method with quantum cryptography authentication. The system includes an optical link connecting a sender and a receiver. The sender transmitting a first optical pulse and a second optical pulse having a defined time delay therebetween. The first pulse is modulated with a first authentication phase shift; and the second pulse is modulated with phases selected from one basis of two non-orthogonal bases, and encoded with one of two orthogonal states within the one basis based on an information of the sender, and with a second authentication phase shift. The receiver includes a splitter receiving and splitting the first and the second pulse into pulses of interest. The split pulses of interest are modulated with the first authentication phase shift; and the second authentication phase shift, respectively. The receiver includes a second coupler whereby the split pulses of interest arrive at the second coupler simultaneously. The receiver includes a first set of detectors receiving the combined pulses, which determine the one basis of the two non-orthogonal bases; and a second set of detectors receiving the combined pulses, and determine the one of the two orthogonal states within the basis and thereby decoding the information of the sender.