Experimental Observation of Four-Photon Entangled Dicke State with High Fidelity

Abstract

We present the experimental observation of the symmetric four-photon entangled Dicke state with two excitations $|D_4^{(2)}>$. A simple experimental set-up allowed quantum state tomography yielding a fidelity as high as $0.844\pm 0.008$. We study the entanglement persistency of the state using novel witness operators and focus on the demonstration of a remarkable property: depending on the orientation of a measurement on one photon, the remaining three photons are projected into both inequivalent classes of genuine tripartite entanglement, the GHZ and W class. Furthermore, we discuss possible applications of $|D_4^{(2)}>$ in quantum communication.

5 pages, 3 figures, submitted

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