{
  "id": "1508.04967",
  "version": "v1",
  "published": "2015-08-20T12:45:31.000Z",
  "updated": "2015-08-20T12:45:31.000Z",
  "title": "Superstrong Coupling of a Microwave Cavity to YIG Magnons",
  "authors": [
    "Nikita Kostylev",
    "Maxim Goryachev",
    "Michael E. Tobar"
  ],
  "comment": "4 pages, 3 figures",
  "categories": [
    "quant-ph"
  ],
  "abstract": "Multiple-post reentrant 3D lumped cavity modes have been realized to design the new concept of discrete Whispering Gallery and Fabry-Perot Modes for multimode microwave Quantum Electrodynamics experiments. Using a magnon spin-wave resonance of a submillimeter-sized Yttrium-Iron- Garnet sphere at millikelvin temperatures and a four-post cavity, we demonstrate the ultra-strong coupling regime between discrete Whispering Gallery Modes and a magnon resonance with strength of 1.84 GHz. By increasing the number of posts to eight and arranging them in a D4 symmetry pattern, we expand the mode structure to that of a discrete Fabry-Perot cavity and show control of the Free Spectral Range (FSR). We reach the superstrong coupling regime, where spin-photon coupling strength is larger than FSR, with coupling strength in the 1.1 to 1.5 GHz range.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-08-20T12:45:31.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "microwave cavity",
      "superstrong coupling",
      "yig magnons",
      "discrete whispering gallery",
      "multimode microwave quantum electrodynamics experiments"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}