Passive decoy state quantum key distribution: Closing the gap to perfect sources
arXiv:quant-ph/0609195 · doi:10.1103/PhysRevA.75.050305
Abstract
We propose a quantum key distribution scheme which closely matches the performance of a perfect single photon source. It nearly attains the physical upper bound in terms of key generation rate and maximally achievable distance. Our scheme relies on a practical setup based on a parametric downconversion source and present-day, non-ideal photon-number detection. Arbitrary experimental imperfections which lead to bit errors are included. We select decoy states by classical post-processing. This allows to improve the effective signal statistics and achievable distance.
4 pages, 3 figures. State preparation corrected
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