H - Electricity – 04 – L
Patent
H - Electricity
04
L
H04L 9/08 (2006.01)
Patent
CA 2152628
A method of communication uses quantum crytogra- phy to encode and decode a signal. A key is distributed on a quantum channel, and information subsequently com- municated between the transmitter (1) and receiver (2) on a public channel to determine whether the key has been inter- cepted. A common transmission medium (3) is used for the quantum channel and public channel. A calibration signal is transmitted over the public channel on the common trans- mission medium to calibrate the system for the subsequent transmission of a key on the quantum channel. The transmis- sion medium may be an optical fibre and the transmitter may switch between a single-photon output and a multiple-photon output to provide the quantum channel and public channel respectively.
Méthode de communication appliquant la cryptographie quantique au codage-décodage de signaux. Une clé est distribuée sur un canal quantique, puis de l'information est transmise entre l'émetteur (1) et le récepteur (2) sur un canal public afin de déterminer si la clé a été interceptée. Le canal quantique et le canal public utilisent un support de transmission commun (3). Un signal étalon est transmis sur le canal public utilisant le support de transmission commun afin d'étalonner le système aux fins de la transmission d'une clé sur le canal quantique. Le support de transmission peut être une fibre optique et l'émetteur peut passer de l'émission d'un photon unique à l'émission de multiples photons selon que la transmission se fait sur le canal quantique ou sur le canal public.
British Telecommunications Public Limited Company
Gowling Lafleur Henderson Llp
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