{
  "annotation_id": "7f23e9d3-435d-4ddc-9622-1d3d5be9b031",
  "date_created": "2026-03-02T18:02:16.747000Z",
  "date_modified": "2026-03-02T18:02:16.747000Z",
  "file_hash": "e1a4caf73ae0d0692645eca2570851d60e6ff43972f0d83d1293c1f2a8be9bfb",
  "private": false,
  "record": {
    "abstract": "We demonstrate that in a coupled two-qubit system any single-qubit gate can\nbe decomposed into two conditional two-qubit gates and that any conditional\ntwo-qubit gate can be implemented by a manipulation analogous to that used for\na controlled two-qubit gate. Based on this we present a unified approach to\nimplement universal single-qubit and two-qubit gates in a coupled two-qubit\nsystem with fixed always-on coupling. This approach requires neither\nsupplementary circuit or additional physical qubits to control the coupling nor\nextra hardware to adjust the energy level structure. The feasibility of this\napproach is demonstrated by numerical simulation of single-qubit gates and\ncreation of two-qubit Bell states in rf-driven inductively coupled two SQUID\nflux qubits with realistic device parameters and constant always-on coupling.",
    "arxiv_id": "quant-ph/0506261",
    "authors": [
      "Zhongyuan Zhou",
      "Shih-I Chu",
      "Siyuan Han"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevB.73.104521",
    "journal_ref": "Phys. Rev. B, 73, 104521 (2006)",
    "title": "A unified approach to realize universal quantum gates in a coupled   two-qubit system with fixed always-on coupling",
    "url": "https://arxiv.org/abs/quant-ph/0506261"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "1f9f7d3e-4130-4db1-9322-e997307e8202",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}