{
  "annotation_id": "2f2356db-edf3-4c01-9acd-770ddb945540",
  "date_created": "2026-03-02T18:02:36.804000Z",
  "date_modified": "2026-03-02T18:02:36.804000Z",
  "file_hash": "27e6bd275357086a15ee838948e7c6b91e12613dfe8ebe7da156022b2d79843f",
  "private": false,
  "record": {
    "abstract": "We report on the experimental realization of a 4-qubit linear cluster state\nvia two photons entangled both in polarization and linear momentum. This state\nwas investigated by performing tomographic measurements and by evaluating an\nentanglement witness. By use of this state we carried out a novel nonlocality\nproof, the so-called ``stronger two observer all versus nothing\u0027\u0027 test of\nquantum nonlocality.",
    "arxiv_id": "quant-ph/0703191",
    "authors": [
      "Giuseppe Vallone",
      "Enrico Pomarico",
      "Paolo Mataloni",
      "Francesco De Martini",
      "Vincenzo Berardi"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.98.180502",
    "journal_ref": "Phys. Rev. Lett. 98, 180502 (2007)",
    "title": "Realization and characterization of a 2-photon 4-qubit linear cluster   state",
    "url": "https://arxiv.org/abs/quant-ph/0703191"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "2fd95647-42da-4739-b1e1-63b9b4773c56",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}