{
  "annotation_id": "15084ecb-254d-4b57-8ee6-c89bc2cfa6c3",
  "date_created": "2026-03-02T18:01:45.263000Z",
  "date_modified": "2026-03-02T18:01:45.263000Z",
  "file_hash": "f8923f425ffa5f2dd5a14e31ea6e672d2b3487c67d021a4420bea59b4738a7de",
  "private": false,
  "record": {
    "abstract": "We demonstrate the first experimental violation of a spin-1 Bell inequality.\nThe spin-1 inequality is a calculation based on the Clauser, Horne, Shimony and\nHolt formalism. For entangled spin-1 particles the maximum quantum mechanical\nprediction is 2.552 as opposed to a maximum of 2, predicted using local hidden\nvariables. We obtained an experimental value of 2.27 $\\pm 0.02$ using the\nfour-photon state generated by pulsed, type-II, stimulated parametric\ndown-conversion. This is a violation of the spin-1 Bell inequality by more than\n13 standard deviations.",
    "arxiv_id": "quant-ph/0105132",
    "authors": [
      "John C. Howell",
      "Antia Lamas-Linares",
      "Dik Bouwmeester"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.88.030401",
    "journal_ref": "Phys. Rev. Lett. 88, 030401 (2002)",
    "title": "Experimental violation of a spin-1 Bell inequality using   maximally-entangled four-photon states",
    "url": "https://arxiv.org/abs/quant-ph/0105132"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ce395839-70c1-4c38-a2eb-64e60b312904",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}