Tuesday, July 06, 2004

Experimental quantum key distribution over highly noisy channels

Authors: L.P. Lamoureux, E. Brainis, N. Cerf, Ph. Emplit,
M. Haelterman, S. Massar
Comments: 4 pages, 2 figures
\ Error filtration is a method for encoding the quantum
state of a single particle into a higher dimensional
Hilbert space in such a way that it becomes less sensitive
to phase noise. We experimentally demonstrate this method by
distributing a secret key over an optical fiber whose noise
level otherwise precludes secure quantum key distribution.
By filtering out the phase noise, a bit error rate of 15.3%
+/- 0.1%, which is beyond the security limit, can be reduced
to 10.6% +/- 0.1%, thereby guaranteeing the cryptographic security.
\\ ( http://arXiv.org/abs/quant-ph/0407031 , 40kb)

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