{
  "annotation_id": "230e8711-4dc2-4aa9-9aba-ae6f75ddaa9f",
  "date_created": "2026-03-02T18:01:45.059000Z",
  "date_modified": "2026-03-02T18:01:45.059000Z",
  "file_hash": "f7d6a5b1002efe9cdedb7bb73e0fe5a3eb7db9c8bc9affc28b5608cfa5f4f15f",
  "private": false,
  "record": {
    "abstract": "We report on energy-time and time-bin entangled photon-pair sources based on\na periodically poled lithium niobate (PPLN) waveguide. Degenerate twin photons\nat 1314 nm wavelength are created by spontaneous parametric down-conversion and\ncoupled into standard telecom fibers. Our PPLN waveguide features a very high\nconversion efficiency of about 10^(-6), roughly 4 orders of magnitude more than\nthat obtained employing bulk crystals. Even if using low power laser diodes,\nthis engenders a significant probability for creating two pairs at a time - an\nimportant advantage for some quantum communication protocols. We point out a\nsimple means to characterize the pair creation probability in case of a pulsed\npump. To investigate the quality of the entangled states, we perform\nphoton-pair interference experiments, leading to visibilities of 97% for the\ncase of energy-time entanglement and of 84% for the case of time-bin\nentanglement. Although the last figure must still be improved, these tests\ndemonstrate the high potential of PPLN waveguide based sources to become a key\nelement for future quantum communication schemes",
    "arxiv_id": "quant-ph/0107125",
    "authors": [
      "S. Tanzilli",
      "H. de Riedmatten",
      "W. Tittel",
      "H. Zbinden",
      "P. Baldi",
      "M. de Micheli",
      "D. B. Ostrowsky",
      "N. Gisin"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1140/epjd/e20020019",
    "title": "PPLN Waveguide for Quantum Communication",
    "url": "https://arxiv.org/abs/quant-ph/0107125"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b8e3aaae-4319-46d4-ab48-993e92d73ca8",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}