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Proceedings Paper

Practical quantum cryptography
Author(s): Alexei Trifonov; Anton Zavriyev; Darius Subacius; Romain Alleaume; Jean-Francois Roch
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Paper Abstract

We report our recent results in development of the secure fiber-optics communication system based upon quantum key distribution (QKD). Emphasize is made on the limitation imposed by the state-of-the-art components crucial for the system performance. We discuss the problem of the interferometer design and highlight the possible security loopholes known. Together with single photon counting performance it places the main restriction on the distance range and the secure key rate of the QKD system based upon the weak coherent pulses. Finally we describe the result of the first test of the system using single photons produced by non-degenerate parametric down-conversion as a source.

Paper Details

Date Published: 24 August 2004
PDF: 11 pages
Proc. SPIE 5436, Quantum Information and Computation II, (24 August 2004); doi: 10.1117/12.542646
Show Author Affiliations
Alexei Trifonov, MagiQ Technologies, Inc. (United States)
Anton Zavriyev, MagiQ Technologies, Inc. (United States)
Darius Subacius, MagiQ Technologies, Inc. (United States)
Romain Alleaume, LPQM/CNRS and Ecole Normale Superieure Cachan (France)
Jean-Francois Roch, LPQM/CNRS and Ecole Normale Superieure Cachan (France)

Published in SPIE Proceedings Vol. 5436:
Quantum Information and Computation II
Eric Donkor; Andrew R. Pirich; Howard E. Brandt, Editor(s)

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