Heidelberg 2015 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 50: Quantum Information: Concepts and Methods VII

Q 50.5: Talk

Thursday, March 26, 2015, 12:00–12:15, K/HS1

Constructing Entanglement Witnesses from Random Local Measurements — •Jochen Szangolies, Hermann Kampermann, and Dagmar Bruß — Institut für Theoretische Physik III, Heinrich-Heine-Universität Düsseldorf, Universitätsstraße 1, D-40255 Düsseldorf

The reliable and effective detection of entanglement is of paramount importance. However, given a random state, assessing its entanglement is a challenging task. To attack this problem, we investigate the use of random local measurements, from which entanglement witnesses are then constructed via semidefinite programming methods. We propose a scheme of progressively increasing the number of measurements until the presence of entanglement can be unambiguously concluded, and investigate its performance in various examples.