{
  "annotation_id": "df540040-7216-4d50-89c2-81a9434b4cdd",
  "date_created": "2026-03-02T18:02:06.080000Z",
  "date_modified": "2026-03-02T18:02:06.080000Z",
  "file_hash": "9d5aacbf86fa51dda30dd462a7543266bc47901a53d109c323beea3af734a4ff",
  "private": false,
  "record": {
    "abstract": "We present an entangled-state quantum cryptography system that operated for\nthe first time in a real world application scenario. The full key generation\nprotocol was performed in real time between two distributed embedded hardware\ndevices, which were connected by 1.45 km of optical fiber, installed for this\nexperiment in the Vienna sewage system. The generated quantum key was\nimmediately handed over and used by a secure communication application.",
    "arxiv_id": "quant-ph/0404115",
    "authors": [
      "A. Poppe",
      "A. Fedrizzi",
      "T. Loruenser",
      "O. Maurhardt",
      "R. Ursin",
      "H. R. Boehm",
      "M. Peev",
      "M. Suda",
      "C. Kurtsiefer",
      "H. Weinfurter",
      "T. Jennewein",
      "A. Zeilinger"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1364/OPEX.12.003865",
    "journal_ref": "Opt. Express 12, 3865-3871 (2004)",
    "title": "Practical Quantum Key Distribution with Polarization-Entangled Photons",
    "url": "https://arxiv.org/abs/quant-ph/0404115"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "db7df892-baca-4429-8e41-4cd1a37c4c70",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}