Experimental observation of four-photon entangled Dicke state with high fidelity

We present the experimental observation of the symmetric four-photon entangled Dicke state with two excitations |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 witn...

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Bibliographic Details
Published in:Physical review letters 2007-02, Vol.98 (6), p.063604-063604, Article 063604
Main Authors: Kiesel, N, Schmid, C, Tóth, G, Solano, E, Weinfurter, H
Format: Article
Language:English
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Summary:We present the experimental observation of the symmetric four-photon entangled Dicke state with two excitations |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 |D_{4};{(2)} in quantum communication.
ISSN:0031-9007
1079-7114
DOI:10.1103/PhysRevLett.98.063604