Device and method for use in quantum crytography

Cryptography – Key management – Having particular key generator

Reexamination Certificate

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Details

C380S256000, C380S277000, C380S278000, C380S041000

Reexamination Certificate

active

07400724

ABSTRACT:
The present invention relates to a quantum cryptography system for the secure key generation, especially with signal sources and analysis channels. The signal sources are arranged spatially separated in such a manner that the wave fronts of light signals emitted by them superimpose partially at the input of the quantum channel. The analysis channels are arranged in such a manner that the wave front of the light signals coming from the quantum channel are split up spatially and at least two of the parts are analyzed in a quantum mechanical state.

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Physical Review Letters; vol. 84, No. 24; Dated Jun. 12, 2000—Daylight Quantum Key Distribution Over 1.6 km; W. T. Buttler, R. T. Hughes, S. K. Lamoreaux, G. L. Morgan, J. E. Nordholt and C.G. Peterson—University of California, Los Alamos National Laboratory, Los Alamos, New Mexico 87545; Received Jan. 14, 2000.
Physical Review A; vol. 63, 012309; Dated Dec. 13, 2000; Long-distance entanglement-based quantum key distribution; Gregoire Ribordy, Jugen Brendel, Jean-Daniel Gautier, Nicolas Gisin and Hugo Zbinden; Gap-Optique, Universite de Geneve, 20 rue de I'Ecole-de-Medecine, 1211 Geneve 4, Switzerland; Received Aug. 7, 2000.
Applied Physics B Lasers and Optics; Towards practical quantum cryptography; Dated Nov. 10, 1999; S. Chiangga, P. Zada, T. Jennewein and H. Weingurter; Received Jul. 27, 1999/Revised version Sep. 3, 1999.

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