{
  "annotation_id": "d4243f42-a116-463e-86d4-da30020d8da7",
  "date_created": "2026-03-02T18:02:06.588000Z",
  "date_modified": "2026-03-02T18:02:06.588000Z",
  "file_hash": "7c85e571d60cb8e3a3fcf14119e0e2b1090e7ba4e11582850a9ae0e4b6d008ed",
  "private": false,
  "record": {
    "abstract": "We show that efficient quantum computation is possible using a disordered\nHeisenberg spin-chain with `always-on\u0027 couplings. Such disorder occurs\nnaturally in nanofabricated systems. Considering a simple chain setup, we show\nthat an arbitrary two-qubit gate can be implemented using just three\nrelaxations of a controlled qubit, which amounts to switching the on-site\nenergy terms at most twenty-one times.",
    "arxiv_id": "quant-ph/0404163",
    "authors": [
      "Chiu Fan Lee",
      "Neil F. Johnson"
    ],
    "categories": [
      "quant-ph",
      "cond-mat.mtrl-sci"
    ],
    "doi": "10.1103/PhysRevA.70.052322",
    "journal_ref": "Phys. Rev. A 70, 052322 (2004)",
    "title": "Efficient quantum computation within a disordered Heisenberg spin-chain",
    "url": "https://arxiv.org/abs/quant-ph/0404163"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "b85931ea-55a3-431b-8c94-d6079960fcfe",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}