{
  "annotation_id": "b11a9ce5-cd96-42a4-9efa-b05733f74855",
  "date_created": "2026-03-02T18:02:33.561000Z",
  "date_modified": "2026-03-02T18:02:33.561000Z",
  "file_hash": "70622675adf6b120d450fb5b21b7d098002dec75a6a0beba91d48b28412d9b3c",
  "private": false,
  "record": {
    "abstract": "We report spontaneous parametric downconversion having an unusually wide\nspectral bandwidth. A collinear type-1 phase-matching configuration is employed\nwith degeneracy near the zero group velocity dispersion frequency. With a\nspectral width of 1080 nm and degenerate wavelength 1885 nm, the source also\nemits a high flux of photon pairs constrained to a cone of only 2 degree\nhalf-angle. A rigorous theoretical approach is developed that confirms the\nexperimental observations. The source properties are consistent with an\nultra-short photon-pair correlation time and, for a narrowband pump, extremely\nhigh-dimensional spectral entanglement.",
    "arxiv_id": "quant-ph/0701105",
    "authors": [
      "Kevin A. O\u0027Donnell",
      "Alfred B. U\u0027Ren"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1364/OL.32.000817",
    "title": "Observation of ultra-broadband, beamlike parametric downconversion",
    "url": "https://arxiv.org/abs/quant-ph/0701105"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "d6259a2a-31f8-4aec-a7a9-86ad9901f595",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}