Developments towards practical free-space quantum cryptography

P. R. Tapster; P. M. Gorman; D. M. Benton; D. M. Taylor; B. S. Lowans

doi:10.1117/12.605539

25 May 2005 Developments towards practical free-space quantum cryptography

P. R. Tapster, P. M. Gorman, D. M. Benton, D. M. Taylor, B. S. Lowans

Author Affiliations +

Proceedings Volume 5815, Quantum Information and Computation III; (2005) https://doi.org/10.1117/12.605539
Event: Defense and Security, 2005, Orlando, Florida, United States

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.

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P. R. Tapster, P. M. Gorman, D. M. Benton, D. M. Taylor, and B. S. Lowans "Developments towards practical free-space quantum cryptography", Proc. SPIE 5815, Quantum Information and Computation III, (25 May 2005); https://doi.org/10.1117/12.605539

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