Equivalence between two-qubit entanglement and secure key distribution.

Acín A; Masanes L; Gisin N

doi:10.1103/PhysRevLett.91.167901

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Journal article

Equivalence between two-qubit entanglement and secure key distribution.

Acín A GAP-Optique, University of Geneva, 20, Rue de l'Ecole de Médecine, CH-1211 Geneva 4, Switzerland.
Masanes L
Gisin N

2003-11-13

Published in:

Physical review letters. - 2003

General Physics and Astronomy

English We study the problem of secret key distillation from bipartite states in the scenario where Alice and Bob can perform measurements only at the single-copy level and classically process the obtained outcomes. Even with these limitations, secret bits can be asymptotically distilled by the honest parties from any two-qubit entangled state, under any individual attack. Our results point out a complete equivalence between two-qubit entanglement and secure key distribution: a key can be established through a one-qubit channel if and only if it allows one to distribute entanglement. These results can be generalized to a higher dimension for all those states that are one-copy distillable.

Language

English

Open access status

green

Identifiers

DOI 10.1103/PhysRevLett.91.167901
PMID 14611441

Persistent URL

https://sonar.ch/global/documents/175262

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