{
  "id": "cond-mat/0310293",
  "version": "v2",
  "published": "2003-10-14T01:45:52.000Z",
  "updated": "2004-11-10T05:18:19.000Z",
  "title": "Measurement of two-qubit states by quantum point contacts",
  "authors": [
    "Tetsufumi Tanamoto",
    "Xuedong Hu"
  ],
  "comment": "10 pages, 8 figures. Full paper is prepared",
  "journal": "J. Phys.: Condens. Matter 17 (2005) 6895",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We solve the master equations of two charged qubits measured by two serially coupled quantum point contacts (QPCs). We describe two-qubit dynamics by comparing entangled states with product states, and show that the QPC current can be used for reading out results of quantum calculations and providing evidences of two-qubit entanglement. We also calculate the concurrence of the two qubits as a function of dephasing rate that originates from the measurement. We conclude that coupled charge qubits can be effectively detected by a QPC-based detector.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2004-11-10T05:18:19.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "two-qubit states",
      "measurement",
      "serially coupled quantum point contacts",
      "qpc current",
      "master equations"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 10,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}