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The Entanglement of the Symmetric Four-photon Dicke State
Christian Schmid, Nikolai Kiesel, Wiesław Laskowski, Enrique Solano, Geza Tóth, Marek Żukowski, Harald Weinfurter
113 - 122
NATO Science for Peace and Security Series - D: Information and Communication Security
Volume 11: Quantum Communication and Security
Abstract

We present an experimental and theoretical characterization of the symmetric four-qubit entangled Dicke state with two excitations D(2)4. We investigate the state's violation of local realism and study its characteristic properties with respect to quantum information applications. For the experimental observation of the state we used photons obtained from parametric down conversion. This allowed, in a simple experimental set-up, quantum state tomography yielding a fidelity as high as 0.844 ± 0.008.

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