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Q: Quantenoptik und Photonik

Q 39: Quanteninformation III

Q 39.3: Vortrag

Donnerstag, 25. März 2004, 17:00–17:15, HS 101

Witnessing multipartite entanglement — •Otfried Gühne¹, Mohamed Bourennane^2,3, Manfred Eibl^2,3, Christian Kurtsiefer², Sascha Gaertner^2,3, Harald Weinfurter^2,3, Philipp Hyllus¹, Dagmar Bruß¹, Maciej Lewenstein¹ und Anna Sanpera¹ — ¹Institut für Theoretische Physik, Universität Hannover, D-30167 Hannover — ²Max-Planck-Institut für Quantenoptik, D-85748 Garching, Germany — ³Sektion Physik, Ludwig-Maximilians-Universität, D-80797 München

We present the experimental detection of genuine multipartite entanglement using entanglement witness operators. To this aim we introduce a canonical way of constructing and decomposing witness operators so that they can be directly implemented with present technology. We apply this method to three- and four-qubit entangled states of polarized photons, giving experimental evidence that the considered states contain true multipartite entanglement.