{
  "annotation_id": "158f6e1b-3c24-4f6c-8acf-7440bcbac645",
  "date_created": "2026-03-02T18:02:34.668000Z",
  "date_modified": "2026-03-02T18:02:34.668000Z",
  "file_hash": "e015f3db9b5a9e0b4a1821c02fe8ba36a5860346285d4b766c2c81ae7ead8f90",
  "private": false,
  "record": {
    "abstract": "Quantum key distribution (QKD) refers to specific quantum strategies which\npermit the secure distribution of a secret key between two parties that wish to\ncommunicate secretly. Quantum cryptography has proven unconditionally secure in\nideal scenarios and has been successfully implemented using quantum states with\nfinite (discrete) as well as infinite (continuous) degrees of freedom. Here, we\nanalyze the efficiency of QKD protocols that use as a resource entangled\ngaussian states and gaussian operations only. In this framework, it has already\nbeen shown that QKD is possible (M. Navascu\\\u0027es et al. Phys. Rev. Lett. 94,\n010502 (2005)) but the issue of its efficiency has not been considered. We\npropose a figure of merit (the efficiency $E$) to quantify the number of\nclassical correlated bits that can be used to distill a key from a sample of\n$N$ entangled states. We relate the efficiency of the protocol to the\nentanglement and purity of the states shared between the parties.",
    "arxiv_id": "quant-ph/0611277",
    "authors": [
      "C. Rod\u00f3",
      "O. Romero-Isart",
      "K. Eckert",
      "A. Sanpera"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1007/s11080-007-9030-x",
    "journal_ref": "Open Syst. Inf. Dyn. 14, 69 (2007)",
    "title": "Efficiency in Quantum Key Distribution Protocols with Entangled Gaussian   States",
    "url": "https://arxiv.org/abs/quant-ph/0611277"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "4c345d94-136c-4c62-98c2-8a47e6e8fa8a",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}