{
  "annotation_id": "76b2b047-6d5b-4d93-a281-dd791652e5c3",
  "date_created": "2026-03-02T18:02:27.561000Z",
  "date_modified": "2026-03-02T18:02:27.561000Z",
  "file_hash": "c96598ecfb3573e22335c92fa79c85fca3a820b336ac5168a93ee77aafbe6df1",
  "private": false,
  "record": {
    "abstract": "The experimental realization of optimal symmetric phase-covariant 1-\u003e2\ncloning of qubit states is presented. The qubits are represented by\npolarization states of photons generated by spontaneous parametric\ndown-conversion. The experiment is based on the interference of two photons on\na custom-made beam splitter with different splitting ratios for vertical and\nhorizontal polarization components. From the measured data we have estimated\nthe implemented cloning transformation using the maximum-likelihood method. The\nresult shows that the realized transformation is very close to the ideal one\nand the map fidelity reaches 94%.",
    "arxiv_id": "quant-ph/0607149",
    "authors": [
      "A. Cernoch",
      "L. Bartuskova",
      "J. Soubusta",
      "M. Jezek",
      "J. Fiurasek",
      "M. Dusek"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.74.042327",
    "journal_ref": "Phys. Rev. A 74, 042327 (2006).",
    "title": "Experimental phase-covariant cloning of polarization states of single   photons",
    "url": "https://arxiv.org/abs/quant-ph/0607149"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "95499a5c-de64-4763-99f6-bf85890dfda8",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}