{
  "id": "0811.3560",
  "version": "v2",
  "published": "2008-11-21T15:29:05.000Z",
  "updated": "2009-06-04T07:53:56.000Z",
  "title": "Nuclear State Preparation via Landau-Zener-Stueckelberg transitions in Double Quantum Dots",
  "authors": [
    "Hugo Ribeiro",
    "Guido Burkard"
  ],
  "comment": "4.1 pages, 2 figures",
  "journal": "Phys. Rev. Lett. 102, 216802 (2009)",
  "doi": "10.1103/PhysRevLett.102.216802",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We theoretically model a nuclear-state preparation scheme that increases the coherence time of a two-spin qubit in a double quantum dot. The two-electron system is tuned repeatedly across a singlet-triplet level-anticrossing with alternating slow and rapid sweeps of an external bias voltage. Using a Landau-Zener-Stueckelberg model, we find that in addition to a small nuclear polarization that weakly affects the electron spin coherence, the slow sweeps are only partially adiabatic and lead to a weak nuclear spin measurement and a nuclear-state narrowing which prolongs the electron spin coherence. This resolves some open problems brought up by a recent experiment [D. J. Reilly et al., Science 321, 817 (2008).]. Based on our description of the weak measurement, we simulate a system with up to n=200 nuclear spins per dot. Scaling in n indicates a stronger effect for larger n.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2009-06-04T07:53:56.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "73.21.La",
      "03.67.Pp",
      "71.70.Jp",
      "76.20.+q"
    ],
    "keywords": [
      "double quantum dot",
      "nuclear state preparation",
      "landau-zener-stueckelberg transitions",
      "electron spin coherence",
      "weak nuclear spin measurement"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "year": 2009,
      "month": "May",
      "volume": 102,
      "number": 21,
      "pages": 216802
    },
    "note": {
      "typesetting": "TeX",
      "pages": 1,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvL.102u6802R"
    }
  }
}