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We report on the experimental observation and characterization of asix-photon entangled Dicke state. We obtain a fidelity as high as0.654$\pm$0.024 and prove genuine six-photon entanglement by, amongst others, atwo-setting witness yielding -0.422$\pm$0.148. This state has remarkableproperties; e.g., it allows obtaining inequivalent entangled states of a lowerqubit number via projective measurements, and it possesses a high entanglementpersistency against qubit loss. We characterize the properties of thesix-photon Dicke state experimentally by detecting and analyzing theentanglement of a variety of multipartite entangled states.

Experimental entanglement of a six-photon symmetric Dicke state