Developments towards practical free-space quantum cryptography


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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Divisions: College of Engineering & Physical Sciences > Aston Institute of Photonics Technology (AIPT)
Additional Information: 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, 176 (June 02, 2005). Copyright 2005 Society of Photo-Optical Instrumentation Engineers. One print or electronic copy may be made for personal use only. Systematic electronic or print reproduction and distribution, duplication of any material in this paper for a fee or for commercial purposes, or modification of the content of the paper are prohibited. doi:
Event Title: Quantum Information and Computation III
Event Type: Other
Event Dates: 2005-03-28
Last Modified: 04 Jan 2024 08:33
Date Deposited: 03 Nov 2014 15:35
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Related URLs: http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Conference contribution
Published Date: 2005-01-01
Authors: Tapster, P.R.
Gorman, P.M.
Benton, D.M. (ORCID Profile 0000-0003-0663-1404)
Taylor, D.M.
Lowans, B.S.



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