{
  "annotation_id": "6f95f472-1130-4a12-855c-8a37bf528a4b",
  "date_created": "2026-03-02T18:02:03.191000Z",
  "date_modified": "2026-03-02T18:02:03.191000Z",
  "file_hash": "56783dd1101973f7e87eeef76bff5fcd96d83e4c17ba8b559da5434eb0d49038",
  "private": false,
  "record": {
    "abstract": "We describe a nuclear magnetic resonance (NMR) experiment which implements an\nefficient one-to-two qubit phase-covariant cloning machine(QPCCM). In the\nexperiment we have achieved remarkably high fidelities of cloning, 0.848 and\n0.844 respectively for the original and the blank qubit. This experimental\nvalue is close to the optimal theoretical value of 0.854. We have also\ndemonstrated how to use our phase-covariant cloning machine for quantum\nsimulations of bit by bit eavesdropping in the four-state quantum key\ndistribution protocol.",
    "arxiv_id": "quant-ph/0311010",
    "authors": [
      "Jiangfeng Du",
      "Thomas Durt",
      "Ping Zou",
      "L. C. Kwek",
      "C. H. Lai",
      "C. H. Oh",
      "Artur Ekert"
    ],
    "categories": [
      "quant-ph"
    ],
    "title": "Experimental demonstration of an efficient quantum phase-covariant   cloning and its possible applications to simulating eavesdropping in quantum   cryptography",
    "url": "https://arxiv.org/abs/quant-ph/0311010"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "f129e984-d3c7-4324-91ea-a1a0b5a95457",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}