{
  "annotation_id": "7d95b64a-9791-4e2b-aa2b-1cadb81a8466",
  "date_created": "2026-03-02T18:02:45.133000Z",
  "date_modified": "2026-03-02T18:02:45.133000Z",
  "file_hash": "5c2542b58dffaee89ef638abf8ab96ccd33f3e0ab40cc5272ef4e07905a38973",
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  "record": {
    "abstract": "The superposition principle is a very basic ingredient of quantum theory.\nWhat may come as a surprise to many students, and even to many practitioners of\nthe quantum craft, is tha superposition has limitations imposed by certain\nrequirements of the theory. The discussion of such limitations arising from the\nso-called superselection rules is the main purpose of this paper. Some of their\nprincipal consequences are also discussed. The univalence, mass and particle\nnumber superselection rules of non-relativistic quantum mechanics are also\nderived using rather simple methods.",
    "arxiv_id": "quant-ph/9809059",
    "authors": [
      "C. Cisneros",
      "R. P. Mart\u00ednez-y-Romero",
      "H. N. Nu\u00f1ez-Yepez",
      "A. L. Salas-Brito"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1088/0143-0807/19/3/005",
    "journal_ref": "Eur.J.Phys. 19 (1998) 237-243",
    "title": "Limitations on the superposition principle: superselection rules in   non-relativistic quantum mechanics",
    "url": "https://arxiv.org/abs/quant-ph/9809059"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c60d8d1d-6adb-4498-a277-2d80487f4f0d",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}