{
  "annotation_id": "d8839e05-6d24-4014-84dd-374f139ec0b3",
  "date_created": "2026-03-02T18:01:49.083000Z",
  "date_modified": "2026-03-02T18:01:49.083000Z",
  "file_hash": "0d11e0887dd01ff84a9b7a8db797391089da15b0fa6f435874f6dfedff2d80c4",
  "private": false,
  "record": {
    "abstract": "The conditions required for spontaneous parametric down-conversion in a\nwaveguide with periodic nonlinearity in the presence of an unguided pump field\nare established. Control of the periodic nonlinearity and the physical\nproperties of the waveguide permits the quasi-phase matching equations that\ndescribe counter-propagating guided signal and idler beams to be satisfied. We\ncompare the tuning curves and spectral properties of such counter-propagating\nbeams to those for co-propagating beams under typical experimental conditions.\nWe find that the counter-propagating beams exhibit narrow bandwidth permitting\nthe generation of quantum states that possess discrete-frequency entanglement.\nSuch states may be useful for experiments in quantum optics and technologies\nthat benefit from frequency entanglement.",
    "arxiv_id": "quant-ph/0201150",
    "authors": [
      "Mark C. Booth",
      "Mete Atature",
      "Giovanni Di Giuseppe",
      "Alexander V. Sergienko",
      "Bahaa E. A. Saleh",
      "Malvin C. Teich"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.66.023815",
    "journal_ref": "Phys. Rev. A 66, 023815 (2002)",
    "title": "Counter-propagating entangled photons from a waveguide with periodic   nonlinearity",
    "url": "https://arxiv.org/abs/quant-ph/0201150"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "438605bf-d564-4a1c-9c6b-c444975fa617",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}