{
  "annotation_id": "5f493fc7-5d8d-48ab-b2f3-2a6857eab562",
  "date_created": "2026-03-02T18:02:10.187000Z",
  "date_modified": "2026-03-02T18:02:10.187000Z",
  "file_hash": "a6134f812579f80d27aee9b0d8dfc78b0c2a95c457f4e46ac37e077c831fb010",
  "private": false,
  "record": {
    "abstract": "We report the generation of polarization entangled photon pairs in the\n1550-nm wavelength band using spontaneous four-wave mixing in a\ndispersion-shifted fiber loop. The use of the fiber-loop configuration made it\npossible to generate polarization entangled states very stably. With accidental\ncoincidences subtracted, we obtained coincidence fringes with \u003e90 %\nvisibilities, and observed a violation of Bell\u0027s inequality by seven standard\ndeviations. We also confirmed the preservation of the quantum correlation\nbetween the photons even after they had been separated by 20 km of optical\nfiber.",
    "arxiv_id": "quant-ph/0408032",
    "authors": [
      "Hiroki Takesue",
      "Kyo Inoue"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.70.031802",
    "journal_ref": "Phys. Rev. A 70, 031802(R) (2004)",
    "title": "Generation of polarization entangled photon pairs and violation of   Bell\u0027s inequality using spontaneous four-wave mixing in fiber loop",
    "url": "https://arxiv.org/abs/quant-ph/0408032"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b77aaef3-d826-4e49-bc56-448d43c50aee",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}