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

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