Berlin 2001 – scientific programme

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Q: Quantenoptik

Q 15: Quantum Information IV

Q 15.5: Talk

Tuesday, April 3, 2001, 18:30–18:45, H 3010

Classification of mixed entangled states via witness operators — •Dagmar Bruss, Anna Sanpera, and Maciej Lewenstein — Inst. f. Theoret. Physik, Universität Hannover

The classification of mixed states according to their entanglement properties is still a formidable task in quantum information theory. Witness operators are shown to be a very useful tool in this context. With their help one can detect the Schmidt number of bipartite states. We introduce a classification scheme for mixed tripartite states and construct the relevant witness operators. Finally, results for properties of bound entangled states are presented.