{
  "id": "2103.10344",
  "version": "v1",
  "published": "2021-03-18T16:03:37.000Z",
  "updated": "2021-03-18T16:03:37.000Z",
  "title": "Circuit quantum electrodynamics (cQED) with modular quasi-lumped models",
  "authors": [
    "Zlatko K. Minev",
    "Thomas G. McConkey",
    "Maika Takita",
    "Antonio D. Corcoles",
    "Jay M. Gambetta"
  ],
  "comment": "For related code, see #QiskitMetal https://qiskit.org/metal | 13 pages, 4 figures, 1 table",
  "categories": [
    "quant-ph",
    "cond-mat.supr-con"
  ],
  "abstract": "Extracting the Hamiltonian of interacting quantum-information processing systems is a keystone problem in the realization of complex phenomena and large-scale quantum computers. The remarkable growth of the field increasingly requires precise, widely-applicable, and modular methods that can model the quantum electrodynamics of the physical circuits, and even of their more-subtle renormalization effects. Here, we present a computationally-efficient method satisfying these criteria. The method partitions a quantum device into compact lumped or quasi-distributed cells. Each is first simulated individually. The composite system is then reduced and mapped to a set of simple subsystem building blocks and their pairwise interactions. The method operates within the quasi-lumped approximation and, with no further approximation, systematically accounts for constraints, couplings, parameter renormalizations, and non-perturbative loading effects. We experimentally validate the method on large-scale, state-of-the-art superconducting quantum processors. We find that the full method improves the experimental agreement by a factor of two over taking standard coupling approximations when tested on the most sensitive and dressed Hamiltonian parameters of the measured devices.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2021-03-18T16:03:37.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "circuit quantum electrodynamics",
      "modular quasi-lumped models",
      "more-subtle renormalization effects",
      "large-scale quantum computers",
      "simple subsystem building blocks"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 13,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}