Experimental error filtration for quantum communication over highly noisy channels

被引：18
作者：
Lamoureux, LP
Brainis, E
Cerf, NJ
Emplit, P
Haelterman, M
Massar, S
机构：
[1] Univ Libre Bruxelles, Ecole Polytech, B-1050 Brussels, Belgium
[2] Univ Libre Bruxelles, Lab Informat Quant, B-1050 Brussels, Belgium
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 23期
关键词：
D O I：
10.1103/PhysRevLett.94.230501
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
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 noise. We have realized a fiber optics demonstration of this method and illustrated its potentialities by carrying out the optical part of a quantum key distribution scheme over a line whose phase noise is too high for a standard implementation of BB84 to be secure. By filtering out the 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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页数：4
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