{
  "id": "1004.4323",
  "version": "v2",
  "published": "2010-04-25T04:25:58.000Z",
  "updated": "2010-10-19T18:32:51.000Z",
  "title": "High-Fidelity Readout in Circuit Quantum Electrodynamics Using the Jaynes-Cummings Nonlinearity",
  "authors": [
    "M. D. Reed",
    "L. DiCarlo",
    "B. R. Johnson",
    "L. Sun",
    "D. I. Schuster",
    "L. Frunzio",
    "R. J. Schoelkopf"
  ],
  "comment": "5 pages, 4 figures",
  "journal": "Phys. Rev. Lett. 105, 173601 (2010)",
  "doi": "10.1103/PhysRevLett.105.173601",
  "categories": [
    "cond-mat.mes-hall",
    "quant-ph"
  ],
  "abstract": "We demonstrate a qubit readout scheme that exploits the Jaynes-Cummings nonlinearity of a superconducting cavity coupled to transmon qubits. We find that in the strongly-driven dispersive regime of this system, there is the unexpected onset of a high-transmission \"bright\" state at a critical power which depends sensitively on the initial qubit state. A simple and robust measurement protocol exploiting this effect achieves a single-shot fidelity of 87% using a conventional sample design and experimental setup, and at least 61% fidelity to joint correlations of three qubits.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2010-10-19T18:32:51.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "42.50.Pq",
      "03.67.-a",
      "85.25.-j"
    ],
    "keywords": [
      "circuit quantum electrodynamics",
      "jaynes-cummings nonlinearity",
      "high-fidelity readout",
      "qubit readout scheme",
      "initial qubit state"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2010,
      "month": "Oct",
      "volume": 105,
      "number": 17,
      "pages": 173601
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2010PhRvL.105q3601R"
    }
  }
}