Quantum cryptography protocols robust against photon number splitting attacks for weak laser pulses implementations

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  • 5 December 2002
Abstract
We define a new class of quantum cryptography (QC) protocols that are robust against the most general photon number splitting attacks. We analyze one of these protocols, which differs from the BB84 only in the classical sifting procedure. These results imply that the data of recent long-distance QC experiments performed with weak laser pulses [D. Stucki et al., New J. Phys. 4, 41 (2002)] lead to unconditionally secure extraction of a secret key.

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