{
  "annotation_id": "adbe0e1c-fefa-48f1-a698-43f0f0e71480",
  "date_created": "2026-03-02T18:01:42.538000Z",
  "date_modified": "2026-03-02T18:01:42.538000Z",
  "file_hash": "8cc799848c0ba1eafce4f49873c9f61fc14444f75bb708a63f51df982709a176",
  "private": false,
  "record": {
    "abstract": "We have constructed an efficient source of photon pairs using a\nwaveguide-type nonlinear device and performed a two-photon interference\nexperiment with an unbalanced Michelson interferometer. Parametric\ndown-converted photons from the nonlinear device are detected by two detectors\nlocated at the output ports of the interferometer. Because the interferometer\nis constructed with two optical paths of different length, photons from the\nshorter path arrive at the detector earlier than those from the longer path. We\nfind that the difference of arrival time and the time window of the coincidence\ncounter are important parameters which determine the boundary between the\nclassical and quantum regime. When the time window of the coincidence counter\nis smaller than the arrival time difference, fringes of high visibility\n(80$\\pm$ 10%) were observed. This result is only explained by quantum theory\nand is clear evidence for quantum entanglement of the interferometer\u0027s optical\npaths.",
    "arxiv_id": "quant-ph/0012028",
    "authors": [
      "Kaoru Sanaka",
      "Karin Kawahara",
      "Takahiro Kuga"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.86.5620",
    "title": "New high-efficiency source of photon pairs for engineering quantum   entanglement",
    "url": "https://arxiv.org/abs/quant-ph/0012028"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "a122b817-b008-4912-bb4e-27957072c775",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}