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Quantum cloning bound and application to quantum key distribution
2013
Physical Review A. Atomic, Molecular, and Optical Physics
We introduce a quantum cloning bound which we apply to a straightforward and relatively direct security proof of the prepare-and-measure Bennett-Brassard 1984 (BB84) quantum key distribution (QKD) protocol against collective attacks. The approach we propose is able to handle the practical problem of source and detector alignment imprecisions in a simple way. Specifically, we derive a keyrate bound for a BB84 implementation in which Alice's source emits four given but arbitrary pure states,
doi:10.1103/physreva.88.012331
fatcat:teosesckubbfblwebr3y4hgxne