{
  "annotation_id": "d781748f-20c2-4376-9c78-36081cc37133",
  "date_created": "2026-03-02T18:01:56.060000Z",
  "date_modified": "2026-03-02T18:01:56.060000Z",
  "file_hash": "387fa5c1c66c2237c61ab8cfeca6262b2cfc3d1cc7fff954b5d353548be242f0",
  "private": false,
  "record": {
    "abstract": "We report the first experimental violation of local realism in four-photon\nGreenberger-Horne-Zeilinger (GHZ) entanglement. In the experiment, the\nnon-statistical GHZ conflicts between quantum mechanics and local realism are\nconfirmed, within the experimental accuracy, by four specific measurements of\npolarization correlations between four photons. In addition, our experimental\nresults not only demonstrate a violation of Mermin-Ardehali-Belinskii-Klyshko\ninequality by 76 standard deviations, but also for the first time provide\nsufficient evidence to confirm the existence of genuine four-particle\nentanglement.",
    "arxiv_id": "quant-ph/0302137",
    "authors": [
      "Zhi Zhao",
      "Tao Yang",
      "Yu-Ao Chen",
      "An-Ning Zhang",
      "Marek Zukowski",
      "Jian-Wei Pan"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.91.180401",
    "title": "Experimental Test of Quantum Nonlocality in Four-photon   Greenberger-Horne-Zeilinger Entanglement",
    "url": "https://arxiv.org/abs/quant-ph/0302137"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "8ab62917-a873-4279-8935-5408c2fea5d9",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}