{
  "annotation_id": "de5885a4-2080-4086-b2ca-de05bd02a979",
  "date_created": "2026-03-02T18:02:33.511000Z",
  "date_modified": "2026-03-02T18:02:33.511000Z",
  "file_hash": "e2c227917affcf685d8f9e4a9d1166496b76f10c23bec24bb4d793a2f6c97edb",
  "private": false,
  "record": {
    "abstract": "We show that the wave packet of a biphoton generated via spontaneous\nparametric down conversion is strongly anisotropic. Its anisotropic features\nmanifest themselves very clearly in comparison of measurements performed in two\ndifferent schemes: when the detector scanning plane is perpendicular or\nparallel to the plane containing the crystal optical axis and the laser axis.\nThe first of these two schemes is traditional whereas the second one gives rise\nto such unexpected new results as anomalously strong narrowing of the biphoton\nwave packet measured in the coincidence scheme and very high degree of\nentanglement. The results are predicted theoretically and confirmed\nexperimentally.",
    "arxiv_id": "quant-ph/0612104",
    "authors": [
      "M. V. Fedorov",
      "M. A. Efremov",
      "P. A. Volkov",
      "E. V. Moreva",
      "S. S. Straupe",
      "S. P. Kulik"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.99.063901",
    "title": "Anisotropically high entanglement of biphotons generated in spontaneous   parametric down conversion",
    "url": "https://arxiv.org/abs/quant-ph/0612104"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "3a83aedb-7049-4e53-ac2b-6a65aaa6ea55",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}