Patent ID: 6778669
Filing Date: 2004-08-17
Classification: H04L

Abstract:
A quantum encryption device comprising a transmitter and a receiver between which an encrypted piece of information is transmitted, wherein the transmitter comprises at least:means to send a first packet of photons and an information photon to the receiver, the information photon following a law of probability s and being lagged with respect to the packet by a period of time &tgr;; means for randomly encoding of the information photon according to diagonal base orientations; and wherein the receiver comprises at least: means for the encoding of a second packet of photons coming from the first packet and lagged substantially by the period of time &tgr; with respect to this first packet; interference means to obtain interference of the information photon received at the receiver with the second packet of photons, the interference means providing a packet of photons to create a quantity of photons substantially equal to Â±2 times the variance &sgr; of the noise due to the second packet.