Generator for producing photon number state

Details Generator for producing photon number state Generator for producing photon number state

G - Physics

02

F

G02F 1/39 (2006.01) H04B 10/00 (2006.01) H04B 10/04 (2006.01) H04L 9/08 (2006.01) H04L 9/38 (2006.01)

Patent

CA 2334251

An apparatus for generating a specified number of photons whose generating time is known, and further an apparatus for generating a specified number of photons in the known schedule are provided. The particularly important specified number is 1 and it is able to be applied to quantum cryptographic communication. The apparatus comprises a photon pair source for generating a photon pair that comprises a signal photon and an idler photon and correlates with the generating time, photon number detectors for detecting the photon number of idler photons, a controller for controlling the gate device in conformity with the information on the photon number form the photon number detector, and a gate device for controlling the emission of the signal photon.

On décrit un appareil qui génère un nombre prédéterminé de photons, plus particulièrement un photon, à un moment défini et à un moment programmé pour des communications quantiques. L'appareil comprend une source prévue pour générer une paire de photons composée d'un photon signal et d'un photon inactif qui sont mutuellement corrélés au moment de la génération ; un détecteur servant à mesurer le nombre de photons inactifs ; un dispositif de commande destiné à commander un dispositif de porte en fonction du nombre de photons mesurés par le détecteur ; et un dispositif de porte prévu pour commander l'émission de photons signal.

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