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- Document type:
- Zeitschriftenaufsatz
- Author(s):
- Lewenstein, M.; Kraus, B.; Horodecki, P.; Cirac, J. I.
- Title:
- Characterization of separable states and entanglement witnesses
- Abstract:
- We provide a canonical form of mixed states in bipartite quantum systems in terms of a convex combination of a separable state and a so-called edge state. We construct entanglement witnesses for all edge states, which allows us to introduce a canonical form of nondecomposable entanglement witnesses and the corresponding positive maps. We also present a nontrivial necessary condition for entanglement witnesses and positive maps to be extremal.
- Journal title:
- Phys. Rev. A 63, 044304 2001-03
- Year:
- 2001
- Journal volume:
- 63
- Year / month:
- 2001-03
- Quarter:
- 1. Quartal
- Month:
- Mar
- Journal issue:
- 4
- Language:
- en
- Fulltext / DOI:
- doi:10.1103/physreva.63.044304
- WWW:
- https://journals.aps.org/pra/abstract/10.1103/PhysRevA.63.044304
- Publisher:
- American Physical Society (APS)
- E-ISSN:
- 1050-29471094-1622
- Date of publication:
- 20.03.2001
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