H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 9/28 (2006.01) H04L 9/08 (2006.01) G02F 1/141 (2006.01)
Patent
CA 2196556
In a method of communication using quantum cryptography, single-photon signals from a highly attenuated source are modulated and subsequently detected. In the step of detecting the modulated signal, the signal is split between two branches according to its encoded state. Signals corresponding to different encoded states are detected independently in the respective branches and the rate of detection of coincident signals is determined. This rate is compared with a threshold to detect the presence of an eavesdropper.
L'invention concerne un procédé de communication faisant appel à la cryptographie quantique. Dans ce procédé, des signaux monophotoniques provenant d'une source très atténuée sont modulés et ensuite détectés. Au stade de la détection du signal modulé, celui-ci est dédoublé en deux branches en fonction de son codage. On détecte indépendamment les signaux correspondants aux différents codages dans les branches respectives et on détermine la vitesse de détection des signaux coïncidents. On compare cette vitesse à un seuil pour repérer une écoute illicite.
British Telecommunications Public Limited Company
Gowling Lafleur Henderson Llp
LandOfFree
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