{
  "id": "1111.0748",
  "version": "v1",
  "published": "2011-11-03T07:59:14.000Z",
  "updated": "2011-11-03T07:59:14.000Z",
  "title": "Pulse control of sudden transition for two qubits in XY spin baths and quantum phase transition",
  "authors": [
    "Da-Wei Luo",
    "Hai-Qing Lin",
    "Jing-Bo Xu",
    "Dao-Xin Yao"
  ],
  "comment": "5 pages, 6 figures",
  "journal": "Phys. Rev. A 84, 062112 (2011)",
  "doi": "10.1103/PhysRevA.84.062112",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We study the dynamics of two initially correlated qubits coupled to their own separate spin baths modeled by a XY spin chain and find the explicit expression of the quantum discord for the system. A sudden transition is found to exist between classical and quantum decoherence by choosing certain initial states. We show that the sudden transition happens near the critical point, which provides a new way to characterize the quantum phase transition. Furthermore, we propose a scheme to prolong the transition time of the quantum discord by applying the bang-bang pulses.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-11-03T07:59:14.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.Pp",
      "03.65.Ta",
      "03.65.Yz",
      "03.67.Mn"
    ],
    "keywords": [
      "quantum phase transition",
      "xy spin baths",
      "pulse control",
      "quantum discord",
      "sudden transition happens"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2011,
      "month": "Dec",
      "volume": 84,
      "number": 6,
      "pages": "062112"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2011PhRvA..84f2112L"
    }
  }
}