{
  "annotation_id": "e8877046-5027-4cd6-ab05-405aa9ffa545",
  "date_created": "2026-03-02T18:02:10.109000Z",
  "date_modified": "2026-03-02T18:02:10.109000Z",
  "file_hash": "169bd114284c0c99a60834d9941b1c102251a9400aaa1f6735f4fd094e177d5d",
  "private": false,
  "record": {
    "abstract": "We consider the optimal cloning of quantum coherent states with single-clone\nand joint fidelity as figures of merit. Both optimal fidelities are attained\nfor phase space translation covariant cloners. Remarkably, the joint fidelity\nis maximized by a Gaussian cloner, whereas the single-clone fidelity can be\nenhanced by non-Gaussian operations: a symmetric non-Gaussian 1-to-2 cloner can\nachieve a single-clone fidelity of approximately 0.6826, perceivably higher\nthan the optimal fidelity of 2/3 in a Gaussian setting. This optimal cloner can\nbe realized by means of an optical parametric amplifier supplemented with a\nparticular source of non-Gaussian bimodal states. Finally, we show that the\nsingle-clone fidelity of the optimal 1-to-infinity cloner, corresponding to a\nmeasure-and-prepare scheme, cannot exceed 1/2. This value is achieved by a\nGaussian scheme and cannot be surpassed even with supplemental bound entangled\nstates.",
    "arxiv_id": "quant-ph/0410058",
    "authors": [
      "N. J. Cerf",
      "O. Krueger",
      "P. Navez",
      "R. F. Werner",
      "M. M. Wolf"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevLett.95.070501",
    "journal_ref": "Phys. Rev. Lett. 95, 070501 (2005)",
    "title": "The optimal cloning of quantum coherent states is non-Gaussian",
    "url": "https://arxiv.org/abs/quant-ph/0410058"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "dd1d22fa-0092-4025-83ff-abd84fc00e97",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}