Robustness of the BB84 quantum key distribution protocol against general coherent attacks

Details Robustness of the BB84 quantum key distribution protocol against general coherent attacks Robustness of the BB84 quantum key distribution protocol against general coherent attacks

2004-03-20

arxiv.org/abs/quant-ph/0403148v2

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

Physics

Quantum Physics

New improved version. A minor mistake has been eliminated

Scientific paper

10.1140/epjd/e2005-00314-3

It is demonstrated that for the entanglement-based version of the Bennett-Brassard (BB84) quantum key distribution protocol, Alice and Bob share provable entanglement if and only if the estimated qubit error rate is below 25% or above 75%. In view of the intimate relation between entanglement and security, this result sheds also new light on the unconditional security of the BB84 protocol in its original prepare-and-measure form. In particular, it indicates that for small qubit error rates 25% is the ultimate upper security bound for any prepare-and-measure BB84-type QKD protocol. On the contrary, for qubit error rates between 25% and 75% we demonstrate that the correlations shared between Alice and Bob can always be explained by separable states and thus, no secret key can be distilled in this regime.

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