{
  "id": "1206.0944",
  "version": "v2",
  "published": "2012-06-05T14:19:09.000Z",
  "updated": "2012-10-08T16:46:55.000Z",
  "title": "Photon Blockade in the Ultrastrong Coupling Regime",
  "authors": [
    "Alessandro Ridolfo",
    "Martin Leib",
    "Salvatore Savasta",
    "Michael J. Hartmann"
  ],
  "comment": "minor revisions, supplementary information added, accepted for publication in PRL",
  "journal": "Phys. Rev. Lett. 109, 193602 (2012)",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We explore photon coincidence counting statistics in the ultrastrong-coupling regime where the atom-cavity coupling rate becomes comparable to the cavity resonance frequency. In this regime usual normal order correlation functions fail to describe the output photon statistics. By expressing the electric-field operator in the cavity-emitter dressed basis we are able to propose correlation functions that are valid for arbitrary degrees of light-matter interaction. Our results show that the standard photon blockade scenario is significantly modified for ultrastrong coupling. We observe parametric processes even for two-level emitters and temporal oscillations of intensity correlation functions at a frequency given by the ultrastrong photon emitter coupling. These effects can be traced back to the presence of two-photon cascade decays induced by counter-rotating interaction terms.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2012-10-08T16:46:55.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "42.50.Pq",
      "03.67.Lx",
      "42.50.Ar",
      "85.25.-j"
    ],
    "keywords": [
      "ultrastrong coupling regime",
      "photon blockade",
      "usual normal order correlation functions",
      "regime usual normal order correlation",
      "normal order correlation functions fail"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review Letters",
      "doi": "10.1103/PhysRevLett.109.193602",
      "year": 2012,
      "month": "Nov",
      "volume": 109,
      "number": 19,
      "pages": 193602
    },
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2012PhRvL.109s3602R"
    }
  }
}