{
  "id": "1309.3646",
  "version": "v2",
  "published": "2013-09-14T10:42:10.000Z",
  "updated": "2014-01-29T16:00:22.000Z",
  "title": "Input-output description of microwave radiation in the dynamical Coulomb blockade",
  "authors": [
    "Juha Leppäkangas",
    "Göran Johansson",
    "Michael Marthaler",
    "Mikael Fogelström"
  ],
  "comment": "29 pages, 4 figures",
  "journal": "New J. Phys. 16 015015 (2014)",
  "doi": "10.1088/1367-2630/16/1/015015",
  "categories": [
    "cond-mat.mes-hall",
    "cond-mat.supr-con"
  ],
  "abstract": "We study microwave radiation emitted by a small voltage-biased Josephson junction connected to a superconducting transmission line. An input-output formalism for the radiation field is established, using a perturbation expansion in the junction's critical current. Using output field operators solved up to the second order, we estimate the spectral density and the second-order coherence of the emitted field. For typical transmission line impedances and at frequencies below the main emission peak at the Josephson frequency, radiation occurs predominantly due to two-photon emission. This emission is characterized by a high degree of photon bunching if detected symmetrically around half of the Josephson frequency. Strong phase fluctuations in the transmission line make related nonclassical phase-dependent amplitude correlations short lived, and there is no steady-state two-mode squeezing. However, the radiation is shown to violate the classical Cauchy-Schwarz inequality of intensity cross-correlations, demonstrating the nonclassicality of the photon pair production in this region.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2014-01-29T16:00:22.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "dynamical coulomb blockade",
      "microwave radiation",
      "phase-dependent amplitude correlations short",
      "input-output description",
      "nonclassical phase-dependent amplitude correlations"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "journal": "New Journal of Physics",
      "year": 2014,
      "month": "Jan",
      "volume": 16,
      "number": 1,
      "pages": "015015"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 29,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2014NJPh...16a5015L"
    }
  }
}