{
  "id": "cond-mat/0701507",
  "version": "v1",
  "published": "2007-01-21T17:27:52.000Z",
  "updated": "2007-01-21T17:27:52.000Z",
  "title": "Dynamical control of electron spin coherence in a quantum dot",
  "authors": [
    "Wenxian Zhang",
    "V. V. Dobrovitski",
    "Lea F. Santos",
    "Lorenza Viola",
    "B. N. Harmon"
  ],
  "comment": "4 pages, 4 figures with 3 of them in color",
  "journal": "Phys. Rev. B 75, 201302(R) (2007).",
  "doi": "10.1103/PhysRevB.75.201302",
  "categories": [
    "cond-mat.mes-hall",
    "quant-ph"
  ],
  "abstract": "We investigate the performance of dynamical decoupling methods at suppressing electron spin decoherence from a low-temperature nuclear spin reservoir in a quantum dot. The controlled dynamics is studied through exact numerical simulation, with emphasis on realistic pulse delays and long-time limit. Our results show that optimal performance for this system is attained by a periodic protocol exploiting concatenated design, with control rates substantially slower than expected from the upper spectral cutoff of the bath. For a known initial electron spin state, coherence can saturate at long times, signaling the creation of a stable ``spin-locked'' decoherence-free subspace. Analytical insight on saturation is obtained for a simple echo protocol, in good agreement with numerical results.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2007-01-21T17:27:52.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "electron spin coherence",
      "quantum dot",
      "dynamical control",
      "initial electron spin state",
      "low-temperature nuclear spin reservoir"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. B"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}