dorsal/arxiv
View SchemaRobustness of the BB84 quantum key distribution protocol against general coherent attacks
| Authors | Georgios M. Nikolopoulos, Gernot Alber |
|---|---|
| Categories | |
| ArXiv ID | quant-ph/0403148 |
| URL | https://arxiv.org/abs/quant-ph/0403148 |
| DOI | 10.1140/epjd/e2005-00314-3 |
| Journal | Eur. Phys. J. D 37, 441 (2006) |
Abstract
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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"abstract": "It is demonstrated that for the entanglement-based version of the\nBennett-Brassard (BB84) quantum key distribution protocol, Alice and Bob share\nprovable entanglement if and only if the estimated qubit error rate is below\n25% or above 75%. In view of the intimate relation between entanglement and\nsecurity, this result sheds also new light on the unconditional security of the\nBB84 protocol in its original prepare-and-measure form. In particular, it\nindicates that for small qubit error rates 25% is the ultimate upper security\nbound for any prepare-and-measure BB84-type QKD protocol. On the contrary, for\nqubit error rates between 25% and 75% we demonstrate that the correlations\nshared between Alice and Bob can always be explained by separable states and\nthus, no secret key can be distilled in this regime.",
"arxiv_id": "quant-ph/0403148",
"authors": [
"Georgios M. Nikolopoulos",
"Gernot Alber"
],
"categories": [
"quant-ph"
],
"doi": "10.1140/epjd/e2005-00314-3",
"journal_ref": "Eur. Phys. J. D 37, 441 (2006)",
"title": "Robustness of the BB84 quantum key distribution protocol against general coherent attacks",
"url": "https://arxiv.org/abs/quant-ph/0403148"
},
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