Experimental quantum key distribution over highly noisy channels

Details Experimental quantum key distribution over highly noisy channels Experimental quantum key distribution over highly noisy channels

2004-07-05

arxiv.org/abs/quant-ph/0407031v1

Physical Review Letters 94, 230501 (2005)

Physics

Quantum Physics

4 pages, 2 figures

Scientific paper

10.1103/PhysRevLett.94.230501

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.

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