Share Email Print
cover

Proceedings Paper

Free-space secure key exchange from 1 m to 1000 km
Author(s): M. S. Godfrey; A. M. Lynch; J. L. Duligall; W. J. Munro; K. J. Harrison; J. G. Rarity
Format Member Price Non-Member Price
PDF $14.40 $18.00

Paper Abstract

Coding data bits in the phase or polarisation state of light allows us to exploit the wave particle duality for novel communication protocols. Using this principle the first practical quantum communication systems have been built. These are the fibre and free-space quantum cryptography apparatus used for secure exchange of keys. To date free space key exchange has aimed at long range with 144km range achieved and future experiments aiming to extend this range to 1000km exchanging keys with low earth orbit satellites. At the other end of the spectrum we are developing low cost hand held systems. These systems could be an effective way for the user to generate a store of secrets shared with a central repository. These secrets can then be used up to protect a wide variety of sensitive classical communications. Examples include on-line PIN protection for consumer transactions and password protection in secure access schemes.

Paper Details

Date Published: 16 October 2006
PDF: 7 pages
Proc. SPIE 6399, Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components/Architectures for Microwave Systems and Displays, 63990E (16 October 2006); doi: 10.1117/12.690521
Show Author Affiliations
M. S. Godfrey, Univ. of Bristol (United Kingdom)
A. M. Lynch, Univ. of Bristol (United Kingdom)
J. L. Duligall, Univ. of Bristol (United Kingdom)
Hewlett-Packard Labs. (United Kingdom)
W. J. Munro, Hewlett-Packard Labs. (United Kingdom)
K. J. Harrison, Hewlett-Packard Labs. (United Kingdom)
J. G. Rarity, Univ. of Bristol (United Kingdom)


Published in SPIE Proceedings Vol. 6399:
Advanced Free-Space Optical Communication Techniques/Applications II and Photonic Components/Architectures for Microwave Systems and Displays
Lars J. Sjöqvist; Rebecca Wilson, Editor(s)

© SPIE. Terms of Use
Back to Top