{
  "annotation_id": "5e9f03c1-bd9f-4dd8-b289-86d7ca3d03ef",
  "date_created": "2026-03-02T18:02:03.429000Z",
  "date_modified": "2026-03-02T18:02:03.429000Z",
  "file_hash": "248092561536f9886e6417b4dc833db997b52ad29e27e48c0feae2f9abf8063a",
  "private": false,
  "record": {
    "abstract": "We propose a class of qubit networks that admit perfect transfer of any\nquantum state in a fixed period of time. Unlike many other schemes for quantum\ncomputation and communication, these networks do not require qubit couplings to\nbe switched on and off. When restricted to N-qubit spin networks of identical\nqubit couplings, we show that 2 log_3 N is the maximal perfect communication\ndistance for hypercube geometries. Moreover, if one allows fixed but different\ncouplings between the qubits then perfect state transfer can be achieved over\narbitrarily long distances in a linear chain.",
    "arxiv_id": "quant-ph/0309131",
    "authors": [
      "Matthias Christandl",
      "Nilanjana Datta",
      "Artur Ekert",
      "Andrew J. Landahl"
    ],
    "categories": [
      "quant-ph",
      "cond-mat"
    ],
    "doi": "10.1103/PhysRevLett.92.187902",
    "journal_ref": "Phys. Rev. Lett. 92, 187902 (2004)",
    "title": "Perfect state transfer in quantum spin networks",
    "url": "https://arxiv.org/abs/quant-ph/0309131"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "083a8cc4-80d2-4dc7-a014-406b17554285",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}