Experimental demonstration of counterfactual quantum key distribution
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- Ren, M., Wu, G., Wu, E. et al. Laser Phys. (2011) 21: 755. doi:10.1134/S1054660X11070267
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Counterfactual quantum key distribution provides natural advantage against the eavesdropping on the actual signal particles. It can prevent the photon-number-splitting attack when a weak coherent light source is used for the practical implementation. We experimentally realized the counterfactual quantum key distribution in an unbalanced Mach-Zehnder interferometer of 12.5-km-long quantum channel with a high-fringe visibility of 97.4%. According to the security analysis, the system was robust against the photon-number-splitting attack. The article is published in the original.