{
  "annotation_id": "e4238ca7-e7c8-4e06-89dc-7408b9000dce",
  "date_created": "2026-03-02T18:02:48.539000Z",
  "date_modified": "2026-03-02T18:02:48.539000Z",
  "file_hash": "62b3ed844c107dd9c14d2b9dcd2ec37d140883c3f8ee62b6956e479d8fcb16ed",
  "private": false,
  "record": {
    "abstract": "Using polarization-entangled photons from spontaneous parametric\ndownconversion, we have implemented Ekert\u0027s quantum cryptography protocol. The\nnear-perfect correlations of the photons allow the sharing of a secret key\nbetween two parties. The presence of an eavesdropper is continually checked by\nmeasuring Bell\u0027s inequalities. We investigated several possible eavesdropper\nstrategies, including pseudo-quantum non-demolition measurements. In all cases,\nthe eavesdropper\u0027s presence was readily apparent. We discuss a procedure to\nincrease her detectability.",
    "arxiv_id": "quant-ph/9912105",
    "authors": [
      "D. S. Naik",
      "C. G. Peterson",
      "A. G. White",
      "A. J. Berglund",
      "P. G. Kwiat"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.84.4733",
    "journal_ref": "Physical Review Letters 84, 4733-4736 (2000).",
    "title": "Entangled state quantum cryptography: Eavesdropping on the Ekert   protocol",
    "url": "https://arxiv.org/abs/quant-ph/9912105"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f20a35ee-9208-4770-92c5-81b1ffe5677b",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}