Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 58: Quantum information: Concepts and methods IV

Q 58.2: Talk

Friday, March 21, 2014, 10:45–11:00, Kinosaal

Witnessing Entanglement with Random Measurements — •Jochen Szangolies, Hermann Kampermann, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40225 Düsseldorf

Characterizing entanglement in an unknown quantum state is, in general, a difficult problem. We investigate the possibility of utilizing randomly oriented measurements for the construction of entanglement witnesses. To this end, we carry out numerical simulations quantifying the probability of successfully distinguishing between entangled and separable states. Furthermore, we optimize the witnesses and study the relation between the detectability of a given state and its total amount of entanglement.