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:
Jul. 22, 2008
Filed:
Jul. 07, 2003
Nicolas Cerf, Brussels, BE;
Rosa Brouri-tualle, Antony, FR;
Philippe Grangier, Saint Rémy les Chevreuse, FR;
Frédéric Grosshans, Paris, FR;
Gilles Van Assche, Brussels, BE;
Jérôme Wenger, Andlau, FR;
Nicolas Cerf, Brussels, BE;
Rosa Brouri-Tualle, Antony, FR;
Philippe Grangier, Saint Rémy les Chevreuse, FR;
Frédéric Grosshans, Paris, FR;
Gilles Van Assche, Brussels, BE;
Jérôme Wenger, Andlau, FR;
Abstract
One aspect of the present invention is related to a quantum cryptographic scheme comprising at least one sending unit including a physical means of encoding and distributing a raw key in the quadrature components of quantum coherent states that are continuously modulated in phase and amplitude, at least one receiving unit containing a physical means of performing homodyne detection of the quantum coherent states in order to measure the quadrature components of the states, a quantum channel for connecting the sending unit to the receiving unit, a two-way authenticated public channel for transmitting non-secret messages between the sending unit and the receiving unit, a quantum key distribution protocol ensuring that the information tapped by a potential eavesdropper can be estimated from the quantum channel parameters, and a direct or reverse reconciliation protocol that converts the raw continuous data into a common binary key.