Journal
PHYSICAL REVIEW LETTERS
Volume 98, Issue 6, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevLett.98.063604
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We present the experimental observation of the symmetric four-photon entangled Dicke state with two excitations vertical bar D-4((2))>. A simple experimental setup allowed quantum state tomography yielding a fidelity as high as 0.844 +/- 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 Greenberger-Horne-Zeilinger and W class. Furthermore, we discuss possible applications of vertical bar D-4((2))> in quantum communication.
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