{
  "annotation_id": "a4d3897e-ca50-469f-b9f6-f8dfd557df9a",
  "date_created": "2026-03-02T18:02:16.974000Z",
  "date_modified": "2026-03-02T18:02:16.974000Z",
  "file_hash": "bcb6351ef0d588e511b9471d23bfc5e69694af56b71c16063b4dd6ece5757481",
  "private": false,
  "record": {
    "abstract": "A necessary and sufficient entanglement criterion based on variances of\nMermin-Klyshko\u0027s Bell operators is proved for multiqubit pure states. Contrary\nto Bell\u0027s inequalities, entangled pure states strictly satisfy a quadratic\ninequality but product ones can attain the equality under some local unitary\ntransformations, which can be obtained by solving a quadratic maximum problem.\nThis presents a characterization of multiqubit pure-state entanglement.",
    "arxiv_id": "quant-ph/0505166",
    "authors": [
      "Zeqian Chen",
      "Quanhua Xu"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.73.034306",
    "journal_ref": "PHYSICAL REVIEW A 73, 034306(2006)",
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "title": "Characterization of multiqubit pure-state entanglement",
    "url": "https://arxiv.org/abs/quant-ph/0505166"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "89f1f5bc-ad80-453f-bd3f-589b5fb60132",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}