{
  "annotation_id": "5961e1bd-d2cd-4325-9a90-181f0bde4820",
  "date_created": "2026-03-02T18:02:13.513000Z",
  "date_modified": "2026-03-02T18:02:13.513000Z",
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  "record": {
    "abstract": "A class of optimal quantum repeaters for qubits is suggested. The schemes are\nminimal, i.e. involve a single additional probe qubit, and optimal, i.e.\nprovide the maximum information adding the minimum amount of noise. Information\ngain and state disturbance are quantified by fidelities which, for our schemes,\nsaturate the ultimate bound imposed by quantum mechanics for randomly\ndistributed signals. Special classes of signals are also investigated, in order\nto improve the information-disturbance trade-off. Extension to higher\ndimensional signals (qudits) is straightforward.",
    "arxiv_id": "quant-ph/0501061",
    "authors": [
      "Marco G. Genoni",
      "Matteo G. A. Paris"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.71.052307",
    "journal_ref": "Phys. Rev. A vol 71, 052307 (2005).",
    "title": "Optimal quantum repeaters for qubits and qudits",
    "url": "https://arxiv.org/abs/quant-ph/0501061"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "ce218a83-e7d2-4c4e-96ce-731d9c97c50e",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}