The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Aug. 17, 2004
Filed:
Nov. 24, 1999
Jean-Claude Lehureau, Sainte Genevieve des Bois, FR;
Thomson-CSF, Paris, FR;
Abstract
A quantum encryption device comprises a transmitter and a receiver between which an encrypted piece of information is transmitted. The transmitter comprises at least means to send a first packet of photons and an information photon to the receiver, the appearance of the information photon following the packet being lagged by a period of time &tgr; according to a law of probability. The transmitter also comprises means for the encoding of the information photon. The receiver comprises at least means for the encoding of a second packet of photons coming from the first packet and substantially lagged by the period of time &tgr; with respect to this packet, and interference means to make an information photon interfere with the second packet of photons. These interference means provide a packet of photons to create a quantity of photons substantially equal to ±2 times the variance of the noise due to the second packet. The invention can be applied to the industrial-scale making of encryption systems.