Developments towards practical free-space quantum cryptography

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

Research output: Chapter in Book/Published conference outputConference publication


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.
Original languageEnglish
Title of host publicationQuantum information and computation III
EditorsEric J. Donkor, Andrew R. Pirich, Howard E. Brandt
Number of pages4
Publication statusPublished - 1 Jan 2005
EventQuantum Information and Computation III - Orlando, FL, United States
Duration: 28 Mar 2005 → …

Publication series

NameSPIE proceedings
ISSN (Print)0277-786X


ConferenceQuantum Information and Computation III
Country/TerritoryUnited States
CityOrlando, FL
Period28/03/05 → …

Bibliographical note

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.



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