{
  "id": "0806.1032",
  "version": "v2",
  "published": "2008-06-05T19:05:06.000Z",
  "updated": "2009-03-19T12:12:10.000Z",
  "title": "State Tomography of a Chain of Qubits Embedded in a Spin Field-Effect Transistor via Repeated Spin-Blockade Measurements on the Edge Qubit",
  "authors": [
    "Kazuya Yuasa",
    "Kosuke Okano",
    "Hiromichi Nakazato",
    "Saori Kashiwada",
    "Kanji Yoh"
  ],
  "comment": "6 pages, 4 figures",
  "journal": "Phys. Rev. B 79 (2009) 075318",
  "doi": "10.1103/PhysRevB.79.075318",
  "categories": [
    "cond-mat.mes-hall",
    "quant-ph"
  ],
  "abstract": "As a possible physical realization of a quantum information processor, a system with stacked self-assembled InAs quantum dots buried in GaAs in adjacent to the channel of a spin field-effect transistor has been proposed. In this system, only one of the stacked qubits, i.e. the edge qubit (the qubit closest to the channel), is measurable via \"spin-blockade measurement.\" It is shown that the state tomography of the whole chain of the qubits is still possible even under such a restricted accessibility. The idea is to make use of the entangling dynamics of the qubits. A recipe for the two-qubit system is explicitly constructed and the effect of an imperfect fidelity of the measurement is clarified. A general scheme for multiple qubits based on repeated measurements is also presented.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2009-03-19T12:12:10.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.65.Wj",
      "85.75.Hh",
      "72.25.Hg",
      "03.67.Lx"
    ],
    "keywords": [
      "spin field-effect transistor",
      "repeated spin-blockade measurements",
      "edge qubit",
      "state tomography",
      "self-assembled inas quantum dots"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review B",
      "year": 2009,
      "month": "Feb",
      "volume": 79,
      "number": 7,
      "pages": "075318"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 6,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvB..79g5318Y"
    }
  }
}