Quantum cryptography system for the secure transmission of...

H - Electricity – 04 – L

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H04L 9/28 (2006.01) C09K 19/02 (2006.01) G02F 1/35 (2006.01) G02F 1/13 (2006.01)

Patent

CA 2278420

Quantum cryptography is a new method, which is secure against interception, for transmitting random keys by way of publicly accessible optical information channels, the low transmission speeds of which are to be increased. This has been achieved by using electro-optical liquid crystal modulators to change the polarization, these being in the form of electrically rotatable delay panels, the two double-refracting axes of which being rotated by the electrical field that is applied through an angle .theta., the size of which is a function of the strength of said field, as a result of which a .lambda./2 delay panel rotates elliptically polarized light that falls on the plate through the angle 2.theta., in the microsecond range. The area of application for the present invention is the transmission of data, secure against being intercepted, by way of publicly accessible transmission lines.

La cryptographie quantique est une nouvelle méthode, qui est protégée contre les interceptions, pour transmettre des clés aléatoires par le biais de canaux de données optiques accessibles au public, dont la faible vitesse de transmission doit être augmentée. Ceci a été réalisé en utilisant des modulateurs électro-optiques à cristaux liquides pour modifier la polarisation, ceux-ci étant sous la forme de panneaux de délai électriquement rotatifs, dont les deux axes à double réfraction sont mis en rotation par le champ électrique qui est appliqué à travers un angle .thêta., dont la taille est fonction de la force dudit champ, à la suite de laquelle un panneau de délai .lambda./2 fait tourner la lumière polarisée de façon elliptique qui tombe sur la plaque grâce à l'angle 2.theta., dans une gamme de microsecondes. Le domaine d'application de la présente invention est la transmission de données protégée contre toute interception, par le biais de lignes de transmission accessibles au public.

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