Robustness of the BB84 quantum key distribution protocol against general coherent attacks
| dc.creator | Nikolopoulos, Georgios M. | |
| dc.creator | Alber, Gernot | |
| dc.date | 2004-03-20 | |
| dc.date | 2005-01-11 | |
| dc.date.accessioned | 2026-07-07T06:27:35Z | |
| dc.date.available | 2026-07-07T06:27:35Z | |
| dc.description | 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. | |
| dc.description | New improved version. A minor mistake has been eliminated | |
| dc.identifier | https://arxiv.org/abs/quant-ph/0403148 | |
| dc.identifier | http://arxiv.org/abs/quant-ph/0403148 | |
| dc.identifier | Eur. Phys. J. D 37, 441 (2006) | |
| dc.identifier | doi:10.1140/epjd/e2005-00314-3 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/97453 | |
| dc.subject | Quantum Physics | |
| dc.title | Robustness of the BB84 quantum key distribution protocol against general coherent attacks | |
| dc.type | text |