{
  "id": "1105.4642",
  "version": "v1",
  "published": "2011-05-23T22:02:36.000Z",
  "updated": "2011-05-23T22:02:36.000Z",
  "title": "Loss and decoherence due to stray infrared light in superconducting quantum circuits",
  "authors": [
    "R. Barends",
    "J. Wenner",
    "M. Lenander",
    "Y. Chen",
    "R. C. Bialczak",
    "J. Kelly",
    "E. Lucero",
    "P. O'Malley",
    "M. Mariantoni",
    "D. Sank",
    "H. Wang",
    "T. C. White",
    "Y. Yin",
    "J. Zhao",
    "A. N. Cleland",
    "John M. Martinis",
    "J. J. A. Baselmans"
  ],
  "comment": "4 pages, 4 figures",
  "journal": "Appl. Phys. Lett. 99, 113507 (2011)",
  "doi": "10.1063/1.3638063",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.supr-con",
    "quant-ph"
  ],
  "abstract": "We find that stray infrared light from the 4 K stage in a cryostat can cause significant loss in superconducting resonators and qubits. For devices shielded in only a metal box, we measured resonators with quality factors Q = 10^5 and qubits with energy relaxation times T_1=120 ns, consistent with a stray light-induced quasiparticle density of 170-230 \\mu m^{-3}. By adding a second black shield at the sample temperature, we found about an order of magnitude improvement in performance and no sensitivity to the 4 K radiation. We also tested various shielding methods, implying a lower limit of Q = 10^8 due to stray light in the light-tight configuration.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2011-05-23T22:02:36.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "stray infrared light",
      "superconducting quantum circuits",
      "decoherence",
      "energy relaxation times",
      "stray light-induced quasiparticle density"
    ],
    "tags": [
      "journal article"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2011arXiv1105.4642B"
    }
  }
}