{
  "annotation_id": "90ec649a-0479-4433-a0a9-0654b6bea74d",
  "date_created": "2026-03-02T18:02:13.694000Z",
  "date_modified": "2026-03-02T18:02:13.694000Z",
  "file_hash": "85ed151d3224c3b836e97accf160b51620619eac94dfed25af9bb9f8314a722a",
  "private": false,
  "record": {
    "abstract": "We demonstrate a new class of frequency-entangled states generated via\nspontaneous parametric down-conversion under extended phase matching\nconditions. Biphoton entanglement with coincident signal and idler frequencies\nis observed over a broad bandwidth in periodically poled KTiOPO$_4$. We\ndemonstrate high visibility in Hong-Ou-Mandel interferometric measurements\nunder pulsed pumping without spectral filtering, which indicates excellent\nfrequency indistinguishability between the down-converted photons. The\ncoincident-frequency entanglement source is useful for quantum information\nprocessing and quantum measurement applications.",
    "arxiv_id": "quant-ph/0410216",
    "authors": [
      "Onur Kuzucu",
      "Marco Fiorentino",
      "Marius A. Albota",
      "Franco N. C. Wong",
      "Franz X. Kaertner"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.94.083601",
    "journal_ref": "PRL vol.94 p.083601 (2005)",
    "title": "Two-photon coincident-frequency-entanglement via extended phase matching",
    "url": "https://arxiv.org/abs/quant-ph/0410216"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "913eec29-5e68-4a49-b24e-074cc2d60d07",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}