Cryptographic receiver

Details Cryptographic receiver Cryptographic receiver

H - Electricity

04

L

H04L 9/08 (2006.01)

Patent

CA 2173481

A cryptographic receiver (10) includes photon detectors (52, 54, 56, 58) arranged to detect photons arriving from filters (22) and (24). A fibre coupler (14) randomly distributes each received photon (16) from an optical fibre to one of two photon channels (18, 20). The filters (22, 24) are each unbalanced Mach-Zehnder interferometers with a phase modulator (34, 44) in one arm (28, 38). The filters (22, 24) impose non-orthogonal measurement bases on photons within the respective channels (18, 20). A signal processor (60) derives a cryptographic key-code by analysis of signals received from the photon detectors (52, 54, 56, 58).

Un récepteur cryptographique (10) comprend des détecteurs de photons (52, 54, 56, 58) disposés de manière à détecter les photons arrivant des filtres (22) et (24). Un dispositif de couplage de fibres (14) distribue au hasard chaque photon (16) reçu par une fibre optique vers l'un des deux canaux à photons (18, 20). Les filtres (22, 24) sont chacun des interféromètres Mach-Zehnder asymétriques dotés d'un modulateur de phase (34, 44) dans un bras (28, 38). Ces filtres (22, 24) affectent des bases de mesure non orthogonales aux photons dans les canaux respectifs (18, 20). Une unité de traitement de signaux (60) dérive un code cryptographique par analyse des signaux provenant des détecteurs de photons (52, 54, 56, 58).

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