{
  "annotation_id": "cab5e2ee-60f9-44a1-afad-88965019644b",
  "date_created": "2026-03-02T18:02:41.542000Z",
  "date_modified": "2026-03-02T18:02:41.542000Z",
  "file_hash": "236e40a6a3d1aa1bdccf56b0a438397da96e0065ce867db13603bc3d8567d766",
  "private": false,
  "record": {
    "abstract": "An experimental demonstration of quantum correlations is presented. Energy\nand time entangled photons at wavelengths of 704 and 1310 nm are produced by\nparametric downconversion in KNbO3 and are sent through optical fibers into a\nbulk-optical (704 nm) and an all-fiber Michelson-interferometer (1310 nm),\nrespectively. The two interferometers are located 35 meters aside from one\nanother. Using Faraday-mirrors in the fiber-interferometer, all birefringence\neffects in the fibers are automatically compensated. We obtained two-photon\nfringe visibilities of up to 95 % from which one can project a violation of\nBell\u0027s inequality by 8 standard deviations. The good performance and the\nauto-aligning feature of Faraday-mirror interferometers show their potential\nfor a future test of Bell\u0027s inequalities in order to examine\nquantum-correlations over long distances.",
    "arxiv_id": "quant-ph/9703023",
    "authors": [
      "W. Tittel",
      "J. Brendel",
      "T. Herzog",
      "H. Zbinden",
      "N. Gisin"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1209/epl/i1997-00509-0",
    "title": "Non-local two-photon correlations using interferometers physically   separated by 35 meters",
    "url": "https://arxiv.org/abs/quant-ph/9703023"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "bdfcd769-8d63-4595-b25f-c16099f68bb0",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}