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Q: Fachverband Quantenoptik und Photonik

Q 37: Quantum Information: Concepts and Methods VI

Q 37.4: Talk

Wednesday, March 2, 2016, 15:15–15:30, e214

The nine ways of four qubit entanglement and their threetangle — •Andreas Osterloh — Universität Duisburg-Essen, Lotharstr. 1, 47048 Duisburg, Germany.

The mixed threetangle for the nine four qubit representant states found in Phys. Rev. A 65, 052112 (2002) is calculated. The convex roof is found exactly in seven out of nine classes. In two classes an upper bound for the threetangle is found, where I have strong evidence that it is at least not far away from the convex roof. We compare our results with the findings of Phys. Rev. Lett. 113, 110501 (2014).