{
  "annotation_id": "ca5d7ac7-801a-445d-9664-4aefb1fbec32",
  "date_created": "2026-03-02T18:02:13.339000Z",
  "date_modified": "2026-03-02T18:02:13.339000Z",
  "file_hash": "d916aeee01b348fd8f1cc8c8533ff23256ab2cc6666a3876c43805acfae9cbfc",
  "private": false,
  "record": {
    "abstract": "A Bell-type inequality is proposed in terms of Wigner-Yanase skew\ninformation, which is quadratic and involves only one local spin observable at\neach site. This inequality presents a hierarchic classification of all states\nof multipartite quantum systems from separable to fully entangled states, which\nis more powerful than the one presented by quadratic Bell inequalities from\ntwo-entangled to fully entangled states. In particular, it is proved that the\ninequality provides an exact test to distinguish entangled from nonentangled\npure states of two qubits. Our inequality sheds considerable light on\nrelationships between quantum entanglement and information theory.",
    "arxiv_id": "quant-ph/0412092",
    "authors": [
      "Zeqian Chen"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.71.052302",
    "journal_ref": "PHYSICAL REVIEW A 71, 052302(2005)",
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "title": "Wigner-Yanase skew information as tests for quantum entanglement",
    "url": "https://arxiv.org/abs/quant-ph/0412092"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "073c309b-773d-4442-8bad-f1118d40dfc1",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}