{
  "annotation_id": "4864e9c7-590b-4ded-85cf-cea35e8b5b20",
  "date_created": "2026-03-02T18:01:49.217000Z",
  "date_modified": "2026-03-02T18:01:49.217000Z",
  "file_hash": "0664e2c80b54930a57f6a850253f1d9c28c3f3a5ccafce396762b9a0746cc48b",
  "private": false,
  "record": {
    "abstract": "We develop and experimentally verify a theory of Type-II spontaneous\nparametric down-conversion (SPDC) in media with inhomogeneous distributions of\nsecond-order nonlinearity. As a special case, we explore interference effects\nfrom SPDC generated in a cascade of two bulk crystals separated by an air gap.\nThe polarization quantum-interference pattern is found to vary strongly with\nthe spacing between the two crystals. This is found to be a cooperative effect\ndue to two mechanisms: the chromatic dispersion of the medium separating the\ncrystals and spatiotemporal effects which arise from the inclusion of\ntransverse wave vectors. These effects provide two concomitant avenues for\ncontrolling the quantum state generated in SPDC. We expect these results to be\nof interest for the development of quantum technologies and the generation of\nSPDC in periodically varying nonlinear materials.",
    "arxiv_id": "quant-ph/0112140",
    "authors": [
      "Giovanni Di Giuseppe",
      "Mete Atature",
      "Matthew D. Shaw",
      "Alexander V. Sergienko",
      "Bahaa E. A. Saleh",
      "Malvin C. Teich"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.66.013801",
    "journal_ref": "Phys. Rev. A 66, 013801 (2002)",
    "title": "Entangled-Photon Generation from Parametric Down-Conversion in Media   with Inhomogeneous Nonlinearity",
    "url": "https://arxiv.org/abs/quant-ph/0112140"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ba6e71a5-594c-4499-92ec-61e1b7556cca",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}