{
  "annotation_id": "7a87db25-82b5-476b-b799-abc4103f9203",
  "date_created": "2026-03-02T18:02:37.508000Z",
  "date_modified": "2026-03-02T18:02:37.508000Z",
  "file_hash": "d5ab3ff84c2af801581d34fcaf18cf0a428eb33377538f32fa46cb180e64125f",
  "private": false,
  "record": {
    "abstract": "An elementary derivation of best eavesdropping strategies for the 4 state\nBB84 quantum cryptography protocol is presented, for both incoherent and\ntwo--qubit coherent attacks. While coherent attacks do not help Eve to obtain\nmore information, they are more powerful to reveal the whole message sent by\nAlice. Our results are based on symmetric eavesdropping strategies, which we\nshow to be sufficient to analyze these kind of problems.",
    "arxiv_id": "quant-ph/9702002",
    "authors": [
      "J. I. Cirac",
      "N. Gisin"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1016/S0375-9601(97)00176-X",
    "title": "Coherent eavesdropping strategies for the 4-state quantum cryptography   protocol",
    "url": "https://arxiv.org/abs/quant-ph/9702002"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "5625992d-eb83-4419-9a7d-e549cd74eccb",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}