Experimental quantum key distribution over highly noisy channels
Quantum Physics
2007-05-23 v1
Abstract
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.
Cite
@article{arxiv.quant-ph/0407031,
title = {Experimental quantum key distribution over highly noisy channels},
author = {L. P. Lamoureux and E. Brainis and N. Cerf and Ph. Emplit and M. Haelterman and S. Massar},
journal= {arXiv preprint arXiv:quant-ph/0407031},
year = {2007}
}
Comments
4 pages, 2 figures