{
  "annotation_id": "22d7ff7b-3f69-4879-9742-96f07c2474d4",
  "date_created": "2026-03-02T18:02:20.775000Z",
  "date_modified": "2026-03-02T18:02:20.775000Z",
  "file_hash": "d9f1aaad3d57081dd61cda4ebe491899d8c12a7bb0f58bffb809a79d6a491823",
  "private": false,
  "record": {
    "abstract": "Linear optics quantum logic operations enabled the observation of a\nfour-photon cluster state. We prove genuine four-partite entanglement and study\nits persistency, demonstrating remarkable differences to the usual GHZ state.\nEfficient analysis tools are introduced in the experiment, which will be of\ngreat importance in further studies on multi-particle entangled states.",
    "arxiv_id": "quant-ph/0508128",
    "authors": [
      "Nikolai Kiesel",
      "Christian Schmid",
      "Ulrich Weber",
      "Otfried Guehne",
      "Geza Toth",
      "Rupert Ursin",
      "Harald Weinfurter"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.95.210502",
    "journal_ref": "Phys. Rev. Lett. 95, 210502 (2005)",
    "title": "Experimental Analysis of a 4-Qubit Cluster State",
    "url": "https://arxiv.org/abs/quant-ph/0508128"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9d80bee8-47c3-46de-8623-e362a00b1a39",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}