{
  "annotation_id": "3d596a36-03c1-47f5-a80c-a363db506639",
  "date_created": "2026-03-02T18:02:27.178000Z",
  "date_modified": "2026-03-02T18:02:27.178000Z",
  "file_hash": "e88478fde2bc29bbf0ea801bd25e78c2f2248b7a8d472b2fdf31b2159071b6db",
  "private": false,
  "record": {
    "abstract": "Violations of a Bell inequality are reported for an experiment where one of\ntwo entangled qubits is stored in a collective atomic memory for a user-defined\ntime delay. The atomic qubit is found to preserve the violation of a Bell\ninequality for storage times up to 21 microseconds, 700 times longer than the\nduration of the excitation pulse that creates the entanglement. To address the\nquestion of the security of entanglement-based cryptography implemented with\nthis system, an investigation of the Bell violation as a function of the\ncross-correlation between the generated nonclassical fields is reported, with\nsaturation of the violation close to the maximum value allowed by quantum\nmechanics.",
    "arxiv_id": "quant-ph/0606249",
    "authors": [
      "H. de Riedmatten",
      "J. Laurat",
      "C. W. Chou",
      "E. W. Schomburg",
      "D. Felinto",
      "H. J. Kimble"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.97.113603",
    "journal_ref": "Phys. Rev. Lett. 97, 113603 (2006)",
    "title": "Direct measurement of decoherence for entanglement between a photon and   stored atomic excitation",
    "url": "https://arxiv.org/abs/quant-ph/0606249"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "603bfe11-a964-487e-a3a6-0a7bac0bd40a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}