{
  "annotation_id": "9f8fc807-e2a1-47b2-93f6-26f698167567",
  "date_created": "2026-03-02T18:02:10.127000Z",
  "date_modified": "2026-03-02T18:02:10.127000Z",
  "file_hash": "70d746cb5466be419381e4b5007c0bea2dc8ba824c674d91843df4442fa1d314",
  "private": false,
  "record": {
    "abstract": "An operational definition of contextuality is introduced which generalizes\nthe standard notion in three ways: (1) it applies to arbitrary operational\ntheories rather than just quantum theory, (2) it applies to arbitrary\nexperimental procedures, rather than just sharp measurements, and (3) it\napplies to a broad class of ontological models of quantum theory, rather than\njust deterministic hidden variable models. We derive three no-go theorems for\nontological models, each based on an assumption of noncontextuality for a\ndifferent sort of experimental procedure; one for preparation procedures,\nanother for unsharp measurement procedures (that is, measurement procedures\nassociated with positive-operator valued measures), and a third for\ntransformation procedures. All three proofs apply to two-dimensional Hilbert\nspaces, and are therefore stronger than traditional proofs of contextuality.",
    "arxiv_id": "quant-ph/0406166",
    "authors": [
      "R. W. Spekkens"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.71.052108",
    "journal_ref": "Phys. Rev. A 71, 052108 (2005)",
    "title": "Contextuality for preparations, transformations, and unsharp   measurements",
    "url": "https://arxiv.org/abs/quant-ph/0406166"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1321ebc2-740a-4d45-a610-7ae56c0d4b0b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}