{
  "id": "cond-mat/0302572",
  "version": "v2",
  "published": "2003-02-27T12:56:17.000Z",
  "updated": "2004-04-29T09:36:57.000Z",
  "title": "Nonequilibrium stabilization of charge states in double quantum dots",
  "authors": [
    "Udo Hartmann",
    "Frank K. Wilhelm"
  ],
  "comment": "5 pages, 5 figures",
  "journal": "Phys. Rev. B 69, 161309(R) (2004)",
  "doi": "10.1103/PhysRevB.69.161309",
  "categories": [
    "cond-mat.mes-hall",
    "quant-ph"
  ],
  "abstract": "We analyze the decoherence of charge states in double quantum dots due to cotunneling. The system is treated using the Bloch-Redfield generalized master equation for the Schrieffer-Wolff transformed Hamiltonian. We show that the decoherence, characterized through a relaxation $\\tau_{r}$ and a dephasing time $\\tau_{\\phi}$, can be controlled through the external voltage and that the optimum point, where these times are maximum, is not necessarily in equilibrium. We outline the mechanism of this nonequilibrium-induced enhancement of lifetime and coherence. We discuss the relevance of our results for recent charge qubit experiments.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2004-04-29T09:36:57.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "double quantum dots",
      "charge states",
      "nonequilibrium stabilization",
      "bloch-redfield generalized master equation",
      "charge qubit experiments"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. B"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 5,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}