{
  "id": "1511.06650",
  "version": "v1",
  "published": "2015-11-20T15:45:29.000Z",
  "updated": "2015-11-20T15:45:29.000Z",
  "title": "Estimation of covariance matrix of macroscopic quantum states",
  "authors": [
    "László Ruppert",
    "Vladyslav C. Usenko",
    "Radim Filip"
  ],
  "comment": "9 pages, 6 figures",
  "categories": [
    "quant-ph"
  ],
  "abstract": "For systems analogous to a linear harmonic oscillator, the simplest way to characterize the state is by a covariance matrix containing the symmetrically-ordered moments of position and momentum. We show that without direct access to either position or momentum, the estimation of the covariance matrix of non-classical states is still possible using interference with a classical noisy and low- intensity reference and linear detection of energy. Such a detection technique will allow to estimate macroscopic quantum states of electromagnetic radiation without a coherent high-intensity local oscillator. It can be directly applied to estimate the covariance matrix of macroscopically bright squeezed states of light.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2015-11-20T15:45:29.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "covariance matrix",
      "estimation",
      "estimate macroscopic quantum states",
      "coherent high-intensity local oscillator",
      "linear harmonic oscillator"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 9,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}