{
  "annotation_id": "bd2923a7-855b-47c6-980b-cf28e7370c2e",
  "date_created": "2026-03-02T18:02:44.419000Z",
  "date_modified": "2026-03-02T18:02:44.419000Z",
  "file_hash": "decb5ca84055edbf060ca7d9b08ab325a880e02e4b428a17f19fa8d0f641f73e",
  "private": false,
  "record": {
    "abstract": "A critique of a recent experiment [Wagh et.al., Phys.Rev.Lett.81, 1992 (7 Sep\n1998)] to measure the noncyclic phase associated with a precessing neutron spin\nin a neutron interferometer, as given by the Pancharatnam criterion, is\npresented. It is pointed out that since the experiment measures, not the\nnoncyclic phase itself, but a quantity derived from it, it misses the most\ninteresting feature of such a phase, namely the different sign associated with\nstates lying in the upper and the lower hemispheres, a feature originating in\nthe existence of a phase singularity. Such effects have earlier been predicted\nand seen in optical interference experiments using polarization of light as the\nspinor [Bhandari, Phys.Rep.281, 1 (Mar 1997)].",
    "arxiv_id": "quant-ph/9810030",
    "authors": [
      "Rajendra Bhandari"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.83.2089",
    "journal_ref": "Phys.Rev.Lett. 83 (1999) 2089",
    "title": "Comment on \"Neutron Interferometric Observation of Noncyclic Phase\"",
    "url": "https://arxiv.org/abs/quant-ph/9810030"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f361af93-ba52-45bc-8497-1163e06c3f4c",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}