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:
Nov. 20, 2007
Filed:
Nov. 09, 2001
Thierry Debuisschert, Orsay, FR;
Thierry Debuisschert, Orsay, FR;
Thales, Neuilly-sur-Seine, FR;
Abstract
Quantum cryptography by polarization ambiguity is generally used but it involves polarization-maintained fibers. This invention proposes an alternative: quantum cryptography by ambiguity in time. It comprises the conversion of K bits to be transmitted into a train of K pulses of particle flows of time width ΔT and whose frequency Tb, is predetermined knowing that each of the K pulses being shifted or not in time such that the kpulse is shifted by a duration trespectively t, with respect to the initial instant of the period depending on the value '0', respectively '1' of the kbit, where k is an integer such that 0≦k<K and the shifts tand tare such that 0≦t,t≦Tb−ΔT and 0<|t−t|<ΔT.