{
  "id": "1909.08778",
  "version": "v1",
  "published": "2019-09-19T02:23:38.000Z",
  "updated": "2019-09-19T02:23:38.000Z",
  "title": "Coherent control and high-fidelity readout of chromium ions in commercial silicon carbide",
  "authors": [
    "Berk Diler",
    "Samuel J. Whiteley",
    "Christopher P. Anderson",
    "Gary Wolfowicz",
    "Marie E. Wesson",
    "Edward S. Bielejec",
    "F. Joseph Heremans",
    "David Awschalom"
  ],
  "comment": "23 pages, 4 figures",
  "categories": [
    "quant-ph",
    "cond-mat.mes-hall",
    "cond-mat.mtrl-sci"
  ],
  "abstract": "Transition metal ions provide a rich set of optically active defect spins in wide bandgap semiconductors. Chromium (Cr4+) in silicon-carbide (SiC) produces a spin-1 ground state with a narrow, spectrally isolated, spin-selective, near-telecom optical interface. However, previous studies were hindered by material quality resulting in limited coherent control. In this work, we implant Cr into commercial 4H-SiC and show optimal defect activation after annealing above 1600 C. We measure an ensemble optical hole linewidth of 31 MHz, an order of magnitude improvement compared to as-grown samples. An in-depth exploration of optical and spin dynamics reveals efficient spin polarization, coherent control, and readout with high fidelity (79%). We report T1 times greater than 1 second at cryogenic temperatures (15 K) with a T2* = 317 nanoseconds and a T2 = 81 microseconds, where spin dephasing times are currently limited by spin-spin interactions within the defect ensemble. Our results demonstrate the potential of Cr4+ in SiC as an extrinsic, optically active spin qubit.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2019-09-19T02:23:38.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "coherent control",
      "commercial silicon carbide",
      "high-fidelity readout",
      "chromium ions",
      "report t1 times greater"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 23,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}