Method and apparatus for polarisation-insensitive quantum...

H - Electricity – 04 – L

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H04L 9/28 (2006.01) H04J 14/08 (2006.01) H04L 9/08 (2006.01)

Patent

CA 2254767

A communication system uses quantum cryptography for the secure distribution of a key. A single-photon signal is phase-modulated and transmitted over a pair of time-multiplexed transmission paths. With each original single-photon signal in a given one of the transmission paths, a duplicate signal is transmitted. The duplicate is identically modulated and orthogonally polarised. At the receiver, the outputs of the two paths are combined interferometrically. A single polarisation-insensitive measurement is derived from the combined contributions of the orthogonally polarised signals.

La présente invention porte sur un système de communication utilisant la cryptographie quantique pour assurer une distribution protégée d'une clef d'accès à un algorithme. Un signal monophotonique subit une modulation de phase, puis est transmis via une paire de trajets de transmission en multiplexage temporel. Chaque signal original monophotonique émis dans l'un des deux trajets de transmission donnés est accompagné de l'émission d'un double de signal. Ce dernier, modulé de la même façon que l'original, subit une polarisation orthogonale. Au niveau du récepteur, les sorties des deux trajets sont combinées par interférométrie. Une mesure unique insensible à la polarisation est déduite des contributions combinées des signaux à polarisation orthogonale.

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