{
  "annotation_id": "13690095-619c-4d70-b5bf-2172bbe8cf8f",
  "date_created": "2026-03-02T18:02:36.799000Z",
  "date_modified": "2026-03-02T18:02:36.799000Z",
  "file_hash": "033356d28f43a55bafbce59f38057d337129fca38d25ebc844280b7bb771d932",
  "private": false,
  "record": {
    "abstract": "We study the two-photon detection amplitude of the down-converted beams in\nspontaneous parametric down-conversion when the physical variable of orbital\nangular momentum is involved, taking into account both conservation and\nnon-conservation of angular momentum. Agreeing with experimental observations,\nour theoretical calculation shows that spatial structure of the two-photon\ndetection amplitude of the down-converted beams carries important information\nabout conservation or non-conservation of orbital angular momentum in\nspontaneous parametric down-conversion.",
    "arxiv_id": "quant-ph/0703187",
    "authors": [
      "Sheng Feng",
      "Chao-Hsiang Chen",
      "Geraldo A. Barbosa",
      "Prem Kumar"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "The conservation of orbital angular momentum and the two-photon   detection amplitude in spontaneous parametric down-conversion",
    "url": "https://arxiv.org/abs/quant-ph/0703187"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "eca64619-39c1-429c-ae3b-83a449ed518a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}