QUANTUM CRYPTOGRAPHY WITH DIRECT CODING OF THE BI-PHOTON LIGHT

摘要

A set of protocols for direct coding/decoding of the bi-photon light is proposed. Security of the protocols is provided by the possibility of obtaining information on the presence/absence of unauthorized intervention in the process of information transfer from the results of measurements for the channel states. Coding is realized by introducing an additional unbalance of the phases of two bi-photon light beams, and decoding is realized by heterodyne detection of quadratures of the bi-photon light followed by calculation of correlations of the quadratures.