{
  "id": "2009.00781",
  "version": "v1",
  "published": "2020-09-02T02:03:43.000Z",
  "updated": "2020-09-02T02:03:43.000Z",
  "title": "Laser-annealing Josephson junctions for yielding scaled-up superconducting quantum processors",
  "authors": [
    "Jared B. Hertzberg",
    "Eric J. Zhang",
    "Sami Rosenblatt",
    "Easwar Magesan",
    "John A. Smolin",
    "Jeng-Bang Yau",
    "Vivek P. Adiga",
    "Martin Sandberg",
    "Markus Brink",
    "Jerry M. Chow",
    "Jason S. Orcutt"
  ],
  "comment": "9 pages, 6 figures, Supplementary Information",
  "categories": [
    "quant-ph",
    "cond-mat.supr-con"
  ],
  "abstract": "As superconducting quantum circuits scale to larger sizes, the problem of frequency crowding proves a formidable task. Here we present a solution for this problem in fixed-frequency qubit architectures. By systematically adjusting qubit frequencies post-fabrication, we show a nearly ten-fold improvement in the precision of setting qubit frequencies. To assess scalability, we identify the types of 'frequency collisions' that will impair a transmon qubit and cross-resonance gate architecture. Using statistical modeling, we compute the probability of evading all such conditions, as a function of qubit frequency precision. We find that without post-fabrication tuning, the probability of finding a workable lattice quickly approaches 0. However with the demonstrated precisions it is possible to find collision-free lattices with favorable yield. These techniques and models are currently employed in available quantum systems and will be indispensable as systems continue to scale to larger sizes.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2020-09-02T02:03:43.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "yielding scaled-up superconducting quantum processors",
      "laser-annealing josephson junctions",
      "qubit frequency",
      "adjusting qubit frequencies post-fabrication",
      "larger sizes"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}