{
  "annotation_id": "b8eec929-00dd-45af-8373-d1218b3a2cae",
  "date_created": "2026-03-02T18:01:52.108000Z",
  "date_modified": "2026-03-02T18:01:52.108000Z",
  "file_hash": "a3f2503655109fc75b87b99fd49860fcd1d9c10c1616fd4ab803edc07631b63e",
  "private": false,
  "record": {
    "abstract": "An experimental scheme for preparing a polarization entangled W states from\nfour photons emitted by parametric down-conversion is proposed. We consider two\ndifferent configurations and a method of improving the yield by using single\nphoton sources. In the proposed scheme, one uses only linear optical elements\nand photon detectors, so that this scheme is feasible by current technologies.",
    "arxiv_id": "quant-ph/0208162",
    "authors": [
      "Takashi Yamamoto",
      "Kiyoshi Tamaki",
      "Masato Koashi",
      "Nobuyuki Imoto"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.66.064301",
    "journal_ref": "Phys. Rev. A66, 064301 (2002).",
    "title": "Polarization Entangled W State using Parametric Down-Conversion",
    "url": "https://arxiv.org/abs/quant-ph/0208162"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "9b7292f9-b703-4048-af6b-983514d92d0c",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}