{
  "annotation_id": "ac8f8108-8df6-4559-98a3-bcd8e78383f9",
  "date_created": "2026-03-02T18:01:53.171000Z",
  "date_modified": "2026-03-02T18:01:53.171000Z",
  "file_hash": "bbe196da5291f26139f0849fcb2edbbde650a9403353eb90d046bb8282412395",
  "private": false,
  "record": {
    "abstract": "Cloning machines, that is, transformations that achieve the best approximate\ncopying of a quantum state compatible with the no-cloning theorem, have been a\nfundamental research topic over the last five years. This study is of\nparticular significance given the close connection between quantum cloning and\nquantum cryptography: using an optimal cloner generally makes it possible to\nobtain a tight bound on the best individual eavesdropping strategy in a quantum\ncryptosystem. In this Chapter, the issue of cloning a continuous-variable\nquantum system will be analyzed, and a Gaussian cloning transformation will be\nintroduced. This cloner, which copies equally well any two canonically\nconjugate continuous variables, duplicates all coherent states with a same\nfidelity (F=2/3). The optical implementation of this cloner and its extension\nto N-to-M cloners will also be discussed. Finally, the use of this cloner for\nthe security assessment of a quantum key distribution scheme relying on\ncontinuous (Gaussian) key carriers will be sketched.",
    "arxiv_id": "quant-ph/0210061",
    "authors": [
      "Nicolas J. Cerf"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Quantum cloning with continuous variables",
    "url": "https://arxiv.org/abs/quant-ph/0210061"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "107b6082-9f69-455e-ba26-dd3d564e8db7",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}