{
  "annotation_id": "02fc9f07-dbe9-403d-b68c-a36b2ef51c72",
  "date_created": "2026-03-02T18:02:34.186000Z",
  "date_modified": "2026-03-02T18:02:34.186000Z",
  "file_hash": "f286312a3f4cf128d2b94e8a028ff5900fe3154a1c2445bdffa04fa056562834",
  "private": false,
  "record": {
    "abstract": "The $\\alpha \\eta$ protocol given by Barbosa \\emph{et al.}, PRL 90, 227901\n(2003) claims to be a secure way of encrypting messages using mesoscopic\ncoherent states. We show that transmission under $\\alpha \\eta$ exposes\ninformation about the secret key to an eavesdropper, and we estimate the rate\nat which an eavesdropper can learn about the key. We also consider the\nconsequences of using further randomization to protect the key and how our\nanalysis applies to this case. We conclude that $\\alpha \\eta$ is not\ninformationally secure.",
    "arxiv_id": "quant-ph/0612058",
    "authors": [
      "Charlene Ahn",
      "Kevin Birnbaum"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1016/j.physleta.2007.05.052",
    "journal_ref": "Phys. Lett. A 370, 131 (2007)",
    "license": "http://arxiv.org/licenses/nonexclusive-distrib/1.0/",
    "title": "Exposed-key weakness of $\\alpha \\eta$",
    "url": "https://arxiv.org/abs/quant-ph/0612058"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ce73c0ca-9f11-477c-8b10-f721e77f23c4",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}