{
  "id": "0706.2757",
  "version": "v1",
  "published": "2007-06-19T10:42:36.000Z",
  "updated": "2007-06-19T10:42:36.000Z",
  "title": "Controlled dynamics of qubits in the presence of decoherence",
  "authors": [
    "D. D. Bhaktavatsala Rao"
  ],
  "comment": "9 pages, 7 figures",
  "journal": "Phys. Rev. A 76, 042312 (2007)",
  "doi": "10.1103/PhysRevA.76.042312",
  "categories": [
    "quant-ph",
    "cond-mat.mes-hall"
  ],
  "abstract": "An exactly solvable model for the decoherence of one and two-qubit states interacting with a spin-bath, in the presence of a time-dependent magnetic field is studied. The magnetic field is static along $\\hat{z}$ direction and oscillatory in the transverse plane. The transition probability and Rabi oscillations between the spin-states of a single qubit is shown to depend on the size of bath, the distribution of qubit-bath couplings and the initial bath polarization. In contrast to the fast Gaussian decay for short times, the polarization of the qubit shows an oscillatory power-law decay for long times. The loss of entanglement for the maximally entangled two-qubit states, can be controlled by tuning the frequency of the rotating field. The decay rates of entanglement and purity for all the Bell-states are same when the qubits are non-interacting, and different when they are interacting.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2007-06-19T10:42:36.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.Lx",
      "03.65.Yz",
      "73.21.La",
      "85.35.Be"
    ],
    "keywords": [
      "controlled dynamics",
      "decoherence",
      "two-qubit states",
      "fast gaussian decay",
      "time-dependent magnetic field"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2007,
      "month": "Oct",
      "volume": 76,
      "number": 4,
      "pages": "042312"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2007PhRvA..76d2312B"
    }
  }
}