{
  "annotation_id": "913ab02b-2525-46ae-9257-d5b0838d3189",
  "date_created": "2026-03-02T18:01:25.420000Z",
  "date_modified": "2026-03-02T18:01:25.420000Z",
  "file_hash": "e407b0d76ea3390d461dcc17bbac8e55f7b54720652671718d489337151eda1a",
  "private": false,
  "record": {
    "abstract": "Atomic two-photon J=0 $\\leftrightarrow$J\u0027=1 transitions are forbidden for\nphotons of the same energy. This selection rule is related to the fact that\nphotons obey Bose-Einstein statistics. We have searched for small violations of\nthis selection rule by studying transitions in atomic Ba. We set a limit on the\nprobability $v$ that photons are in exchange-antisymmetric states:\n$v\u003c1.2\\cdot10^{-7}$.",
    "arxiv_id": "physics/9906025",
    "authors": [
      "D. DeMille",
      "D. Budker",
      "N. Derr",
      "E. Deveney"
    ],
    "categories": [
      "physics.atom-ph"
    ],
    "doi": "10.1103/PhysRevLett.83.3978",
    "title": "Search for exchange-antisymmetric two-photon states",
    "url": "https://arxiv.org/abs/physics/9906025"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "c72b8f7b-5377-413a-8127-40c705f93e0f",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}