Title: A quantitative witness for Greenberger-Horne-Zeilinger entanglement

Speaker: Dr. Christopher Philipp Eltschka, Institut rur Theoretische Physik Universität Regensburg 93040 Regensburg, Germany

Time and place: 13:30-14:30[1:30-2:30p, Dec. 4, 2012, Room 111, Physics Building

Abstract:

Quantifying multipartite mixed-state entanglement is a notorically difficult problem. Even getting an useful lower bound is a non-trivial task. We use an exact solution for the three-tangle for a subset of states to define a quantitative witness giving us a good lower bound for the three-tangle of arbitrary three-qubit states. The method is applicable to any system with a known solution of an appropriate entanglement monotone on a suitable subset.

Biography:

Dr. Christopher Philipp Eltschka is currently a Postdoc at Universität Regensburg. he got Ph.D. at the Technische Universität München in 2001. then was Postdoc at theTechnische Universität Wien until 2002, and since 2003 he had several Postdoc positions in Regensburg on different topics. In 2005, he was for three months as guest scientist at the Max Planck Institut für PhysikKomplexer Systeme. his latest research topics are quantum entanglementand thermopower. Published several papers in PRL and PRA.