SYSTEM FOR SECURE OPTICAL TRANSMISSION OF BINARY CODE

摘要

The invention concerns a system for optical transmission of binary code comprising a transmitter including: means for generating a light beam; phase-shifting means; attenuating means such that the intensity of the lateral modes are sufficiently low so that not more than one photon is present in the lateral modes. The phase-shifting means of the transmitter imposes a phase shift which is randomly selected equal to 0 or pi /2 for a first bit value or to pi or to 3 pi /2 for a second bit value, and the receiver comprises means for detecting the presence of a photon in the first lateral mode, and means for detecting the presence of a photon in the second lateral mode, a first bit value being detected when the presence of a photon is detected for the first lateral mode, a second bit value being detected when the presence of a photon is detected for the second lateral mode.