Postponement of dark-count effects in practical quantum key-distribution by two-way post-processing A. Khalique, G. M. Nikolopoulos and G. Alber Eur. Phys. J. D, 40 3 (2006) 453-464 Published online: 14 July 2006 DOI: 10.1140/epjd/e2006-00167-2