{
  "id": "cond-mat/0411425",
  "version": "v2",
  "published": "2004-11-16T22:00:02.000Z",
  "updated": "2005-04-09T23:25:32.000Z",
  "title": "Models of environment and T_1 relaxation in Josephson Charge Qubits",
  "authors": [
    "Lara Faoro",
    "Joakim Bergli",
    "Boris L. Altshuler",
    "Yuri M. Galperin"
  ],
  "comment": "4 pages, 3 figures",
  "journal": "Phys. Rev. Lett. 95, 046805 (2005)",
  "doi": "10.1103/PhysRevLett.95.046805",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.supr-con"
  ],
  "abstract": "A theoretical interpretation of the recent experiments of Astafiev et. al. on the T_1-relaxation rate in Josephson Charge Qubits is proposed. The experimentally observed reproducible nonmonotonic dependence of T_1 on the splitting E_J of the qubit levels suggests further specification of the previously proposed models of the background charge noise. From our point of view the most promising is the ``Andreev fluctuator'' model of the noise. In this model the fluctuator is a Cooper pair that tunnels from a superconductor and occupies a pair of localized electronic states. Within this model one can naturally explain both the average linear T_1(E_J) dependence and the irregular fluctuations. The role of fluctuators in the formation of strong resonant peaks in this dependence is also discussed.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2005-04-09T23:25:32.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "josephson charge qubits",
      "environment",
      "relaxation",
      "background charge noise",
      "strong resonant peaks"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. Lett."
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}