{
  "id": "quant-ph/0606234",
  "version": "v1",
  "published": "2006-06-28T14:08:56.000Z",
  "updated": "2006-06-28T14:08:56.000Z",
  "title": "Experimental Observation of Four-Photon Entangled Dicke State with High Fidelity",
  "authors": [
    "Nikolai Kiesel",
    "Christian Schmid",
    "Geza Toth",
    "Enrique Solano",
    "Harald Weinfurter"
  ],
  "comment": "5 pages, 3 figures, submitted",
  "journal": "Phys. Rev. Lett. 98, 063604 (2007)",
  "doi": "10.1103/PhysRevLett.98.063604",
  "categories": [
    "quant-ph"
  ],
  "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.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2006-06-28T14:08:56.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "experimental observation",
      "high fidelity",
      "symmetric four-photon entangled dicke state",
      "genuine tripartite entanglement",
      "simple experimental set-up"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}