{
  "id": "1507.07929",
  "version": "v1",
  "published": "2015-07-28T20:00:36.000Z",
  "updated": "2015-07-28T20:00:36.000Z",
  "title": "Optical Control of Donor Spin Qubits in Silicon",
  "authors": [
    "M. J. Gullans",
    "J. M. Taylor"
  ],
  "comment": "11 pages, 6 figures",
  "categories": [
    "cond-mat.mes-hall",
    "quant-ph"
  ],
  "abstract": "We show how to achieve optical, spin-selective transitions from the ground state to excited orbital states of group-V donors (P, As, Sb, Bi) in silicon. We consider two approaches based on either resonant, far-infrared (IR) transitions of the neutral donor or resonant, near-IR excitonic transitions. For far-IR light, we calculate the dipole matrix elements between the valley-orbit and spin-orbit split states for all the goup-V donors using effective mass theory. We then calculate the maximum rate and amount of electron-nuclear spin-polarization achievable through optical pumping with circularly polarized light. We find this approach is most promising for Bi donors due to their large spin-orbit and valley-orbit interactions. Using near-IR light, spin-selective excitation is possible for all the donors by driving a two-photon $\\Lambda$-transition from the ground state to higher orbitals with even parity. We show that externally applied electric fields or strain allow similar, spin-selective $\\Lambda$-transition to odd-parity excited states. We anticipate these results will be useful for future spectroscopic investigations of donors, quantum control and state preparation of donor spin qubits, and for developing a coherent interface between donor spin qubits and single photons.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-07-28T20:00:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "donor spin qubits",
      "optical control",
      "ground state",
      "dipole matrix elements",
      "spin-orbit split states"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 11,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}