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Proceedings Paper

Developments towards practical free-space quantum cryptography
Author(s): P. R. Tapster; P. M. Gorman; D. M. Benton; D. M. Taylor; B. S. Lowans
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Paper Abstract

We describe a free space Quantum cryptography system which is designed to allow continuous unattended key exchanges for periods of several days, and over ranges of a few kilometres. The system uses a four laser faint pulse transmission system running at a pulse rate of 10MHz to generate the required four alternative polarization states. The receiver module similarly automatically selects a measurement basis and performs polarization measurements with four avalanche photodiodes. The controlling software can implement the full key exchange including sifting, error correction, and privacy amplification required to generate a secure key.

Paper Details

Date Published: 25 May 2005
PDF: 4 pages
Proc. SPIE 5815, Quantum Information and Computation III, (25 May 2005); doi: 10.1117/12.605539
Show Author Affiliations
P. R. Tapster, QinetiQ Ltd. (United Kingdom)
P. M. Gorman, QinetiQ Ltd. (United Kingdom)
D. M. Benton, QinetiQ Ltd. (United Kingdom)
D. M. Taylor, QinetiQ Ltd. (United Kingdom)
B. S. Lowans, QinetiQ Ltd. (United Kingdom)


Published in SPIE Proceedings Vol. 5815:
Quantum Information and Computation III
Eric J. Donkor; Andrew R. Pirich; Howard E. Brandt, Editor(s)

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