{
  "id": "1409.6285",
  "version": "v1",
  "published": "2014-09-22T19:29:54.000Z",
  "updated": "2014-09-22T19:29:54.000Z",
  "title": "Donor Spin Qubits in Ge-based Phononic Crystals",
  "authors": [
    "V. N. Smelyanskiy",
    "V. V. Hafiychuk",
    "F. T. Vasko",
    "A. G. Petukhov"
  ],
  "comment": "18 pages, 7 figures",
  "categories": [
    "cond-mat.mes-hall"
  ],
  "abstract": "We propose qubits based on shallow donor electron spins in germanium. Spin-orbit interaction for donor spins in germanium is in many orders of magnitude stronger than in silicon. In a uniform bulk material it leads to very short spin lifetimes. However the lifetime increases dramatically when the donor is placed into a quasi-2D phononic crystal and the energy of the Zeeman splitting is tuned to lie within a phonon bandgap. In this situation single phonon processes are suppressed by energy conservation. The remaining two-phonon decay channel is very slow. The Zeeman splitting within the gap can be fine tuned to induce a strong, long-range coupling between the spins of remote donors via exchange by virtual phonons. This, in turn, opens a very efficient way to manipulate the quits. We explore various geometries of phononic crystals in order to maximize the coherent qubit-qubit coupling while keeping the decay rate minimal. We find that phononic crystals with unit cell sizes of 100-150 nm are viable candidates for quantum computing applications and suggest several spin-resonance experiments to verify our theoretical predictions.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2014-09-22T19:29:54.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "donor spin qubits",
      "ge-based phononic crystals",
      "situation single phonon processes",
      "shallow donor electron spins",
      "uniform bulk material"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 18,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014arXiv1409.6285S"
    }
  }
}