{
  "annotation_id": "6f6cbae3-1c7a-44bf-8b61-43a2ff066b4b",
  "date_created": "2026-03-02T18:02:10.389000Z",
  "date_modified": "2026-03-02T18:02:10.389000Z",
  "file_hash": "3542f2509f7923c5005390e32514b8f47f71156f544b8f50a3b58bde210057aa",
  "private": false,
  "record": {
    "abstract": "We demonstrate a quantum error correction scheme that protects against\naccidental measurement, using an encoding where the logical state of a single\nqubit is encoded into two physical qubits using a non-deterministic photonic\nCNOT gate. For the single qubit input states |0\u003e, |1\u003e, |0\u003e+|1\u003e, |0\u003e-|1\u003e,\n|0\u003e+i|1\u003e, and |0\u003e-i|1\u003e our encoder produces the appropriate 2-qubit encoded\nstate with an average fidelity of 0.88(3) and the single qubit decoded states\nhave an average fidelity of 0.93(5) with the original state. We are able to\ndecode the 2-qubit state (up to a bit flip) by performing a measurement on one\nof the qubits in the logical basis; we find that the 64 1-qubit decoded states\narising from 16 real and imaginary single qubit superposition inputs have an\naverage fidelity of 0.96(3).",
    "arxiv_id": "quant-ph/0408064",
    "authors": [
      "J. L. O\u0027Brien",
      "G. J. Pryde",
      "A. G. White",
      "T. C. Ralph"
    ],
    "categories": [
      "quant-ph"
    ],
    "doi": "10.1103/PhysRevA.71.060303",
    "journal_ref": "Phys.Rev.A71:060303,2005",
    "title": "High-Fidelity Z-Measurement Error Correction of Optical Qubits",
    "url": "https://arxiv.org/abs/quant-ph/0408064"
  },
  "schema_id": "dorsal/arxiv",
  "source": {
    "execution_id": "224144df-5bdb-4a7c-9be4-4ca0a01dd1c6",
    "id": "arXiv Dataset IDs",
    "type": "Model",
    "variant": "snapshot-2026-03-01",
    "version": "0.1.0"
  },
  "user_id": 1000002
}