{
  "annotation_id": "e544434d-5be7-4c16-be93-cedd7532a6e9",
  "date_created": "2026-03-02T18:02:10.014000Z",
  "date_modified": "2026-03-02T18:02:10.014000Z",
  "file_hash": "c6a2bd30f59c6b29a23efda148d3fea458007a6ce22ddcfbd1498114c9e4a1c7",
  "private": false,
  "record": {
    "abstract": "Universal quantum computation requiring only the Heisenberg exchange\ninteraction and suppressing decoherence via an energy gap is presented. The\ncombination of an always-on exchange interaction between the three physical\nqubits comprising the encoded qubit and a global magnetic field generates an\nenergy gap between the subspace of interest and all other states. This energy\ngap suppresses decoherence. Always-on exchange couplings greatly simplify\nhardware specifications and the implementation of inter-logical-qubit gates. A\ncontrolled phase gate can be implemented using only three Heisenberg exchange\noperations all of which can be performed simultaneously.",
    "arxiv_id": "quant-ph/0408037",
    "authors": [
      "Yaakov S. Weinstein",
      "C. Stephen Hellberg"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.72.022319",
    "journal_ref": "Phys. Rev. A, 72, 022319 (2005)",
    "title": "Energetic Suppression of Decoherence in Exchange-Only Quantum   Computation",
    "url": "https://arxiv.org/abs/quant-ph/0408037"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1261dfe9-a4f1-4b58-8462-2eda2f869bf2",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}