{
  "annotation_id": "952204d2-0200-4da3-b859-055efa047688",
  "date_created": "2026-03-02T18:02:10.165000Z",
  "date_modified": "2026-03-02T18:02:10.165000Z",
  "file_hash": "33e130c04251ff3dc0a7ebca6eb025cc613364cb245f1328cf856725b54ede5f",
  "private": false,
  "record": {
    "abstract": "We analyze the significance for quantum key distribution (QKD) of free-space\nquantum communications results reported in a recent paper (J. C. Bienfang et\nal., quant-ph/0405097, hereafter referred to as \"Bienfang et al.\"), who\ncontrast the quantum communications rate of their partial QKD implementation\n(which does not produce cryptographically useful shared, secret keys) over a\nshort transmission distance, with the secret bit rates of previous full QKD\nimplementations over much longer distances. We show that when a\ncryptographically relevant comparison with previous results is made, the system\ndescribed by Bienfang et al. would offer no advantages for QKD, contrary to\nassertions in their paper and in spite of its high clock rate. Further, we show\nthat the claim made by Bienfang et al. that \"high transmission rates serve ...\nto extend the distance over which a QKD system can operate\" is incorrect. Our\nanalysis illustrates an important aspect of QKD that is too often overlooked in\nexperiments: the sifted bit rate can be a highly misleading indicator of the\nperformance of a QKD system.",
    "arxiv_id": "quant-ph/0407050",
    "authors": [
      "Richard J. Hughes",
      "Jane E. Nordholt"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Comment on \"Quantum key distribution with 1.25 Gbps clock   synchronization\" by J.C. Bienfang et al., quant-ph/0405097",
    "url": "https://arxiv.org/abs/quant-ph/0407050"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ff4b7112-e6c8-4852-a1f2-843021252498",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}