Stuttgart 2012 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 49: Quanteninformation: Konzepte und Methoden 5

Q 49.1: Talk

Thursday, March 15, 2012, 14:00–14:15, V7.01

Local decoherence models and the robustness of multipartite quantum entanglement — •Mazhar Ali and Otfried Guehne — Naturwissenschaftlich-Technische Fakultaet, Universitaet Siegen, Walter-Flex-Straße 3, 57068 Siegen, Germany

We study the dynamics of multipartite quantum entanglement under various types of decoherence. In particular, we investigate the robustness of genuine multipartite entanglement of GHZ-type states by exposing each qubit to noise with different rates and also for different noise models. We also ask the question whether GHZ-states mixed with white noise can be dynamically converted to PPT-entangled states. We found that for all well known decoherence processes this is impossible but this possibility can not be ruled out for general processes which maps X-states to X-states. Finally, we compare the robustness of genuine entanglement of Cluster states and Dicke states with these results.