Provable entanglement and information cost for qubit-based quantum key-distribution protocols

Details Provable entanglement and information cost for qubit-based quantum key-distribution protocols Provable entanglement and information cost for qubit-based quantum key-distribution protocols

2005-11-22

arxiv.org/abs/quant-ph/0511218v1

Eur. Phys. J. D 37, 441 (2006)

Physics

Quantum Physics

Published online in Eur. Phys. J. D

Scientific paper

10.1140/epjd/e2005-00314-3

Provable entanglement has been shown to be a necessary precondition for unconditionally secure key generation in the context of quantum cryptographic protocols. We estimate the maximal threshold disturbance up to which the two legitimate users can prove the presence of quantum correlations in their data, in the context of the four- and six-state quantum key-distribution protocols, under the assumption of coherent attacks. Moreover, we investigate the conditions under which an eavesdropper can saturate these bounds, by means of incoherent and two-qubit coherent attacks. A direct connection between entanglement distillation and classical advantage distillation is also presented.

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