We introduce a new class of quantum quantum key distribution protocols, tailored to be robust against photon number splitting (PNS) attacks. We study one of these protocols, which differs from the BB84 only in the classical sifting procedure. This protocol is provably better than BB84 against PNS attacks at zero error.
@article{arxiv.quant-ph/0211131,
title = {Quantum cryptography protocols robust against photon number splitting attacks for weak laser pulses implementations},
author = {Valerio Scarani and Antonio Acin and Gregoire Ribordy and Nicolas Gisin},
journal= {arXiv preprint arXiv:quant-ph/0211131},
year = {2009}
}