METHOD AND DEVICE FOR SYNCHRONIZING AND ACQUIRING TWIN PHOTONS FOR A QUANTUM CRYPTOGRAPHY PROCESS

摘要

A synchronizing method for a quantum cryptography process including the steps of: supplying a first/second photon in an entangled pair (7) to a first/second receiving station (4, 5); comparing, at each receiving station, the polarization of each received photon with a randomly selected first reference base or second reference base; measuring, at each receiving station (4, 5), the time difference ΔT between the acquisition instant tn of one photon and the acquisition instant tn-1 of the preceding received photon; and recognizing a pair of twin photons when the time difference ΔTa measured at a first receiving station (4) and the corresponding time difference ΔTb measured at a second receiving station (5) substantially coincide.