title: Experimental entanglement of a six-photon symmetric Dicke state.
abstract: We report on the experimental observation and characterization of a six-photon entangled Dicke state. We obtain a fidelity as high as 0.654+/-0.024 and prove genuine six-photon entanglement by, amongst others, a two-setting witness yielding -0.422+/-0.148. This state has remarkable properties; e.g., it allows obtaining inequivalent entangled states of a lower qubit number via projective measurements, and it possesses a high entanglement persistency against qubit loss. We characterize the properties of the six-photon Dicke state experimentally by detecting and analyzing the entanglement of a variety of multipartite entangled states.
authors: Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany. witlef.wieczorek@mpq.mpg.de
authors: Witlef
authors: W
authors: Wieczorek
authors: Roland
authors: R
authors: Krischek
authors: Nikolai
authors: N
authors: Kiesel
authors: Patrick
authors: P
authors: Michelberger
authors: Géza
authors: G
authors: Tóth
authors: Harald
authors: H
authors: Weinfurter