{
  "id": "0904.0456",
  "version": "v2",
  "published": "2009-04-02T20:07:18.000Z",
  "updated": "2009-06-18T20:51:44.000Z",
  "title": "Quantum phase estimation with lossy interferometers",
  "authors": [
    "R. Demkowicz-Dobrzanski",
    "U. Dorner",
    "B. J. Smith",
    "J. S. Lundeen",
    "W. Wasilewski",
    "K. Banaszek",
    "I. A. Walmsley"
  ],
  "comment": "12 pages, 5 figures",
  "journal": "Phys. Rev. A 80, 013825 (2009)",
  "doi": "10.1103/PhysRevA.80.013825",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We give a detailed discussion of optimal quantum states for optical two-mode interferometry in the presence of photon losses. We derive analytical formulae for the precision of phase estimation obtainable using quantum states of light with a definite photon number and prove that maximization of the precision is a convex optimization problem. The corresponding optimal precision, i.e. the lowest possible uncertainty, is shown to beat the standard quantum limit thus outperforming classical interferometry. Furthermore, we discuss more general inputs: states with indefinite photon number and states with photons distributed between distinguishable time bins. We prove that neither of these is helpful in improving phase estimation precision.",
  "revisions": [
    {
      "version": "v2",
      "updated": "2009-06-18T20:51:44.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "42.50.St",
      "03.65.Ta",
      "06.20.Dk",
      "42.50.Lc"
    ],
    "keywords": [
      "quantum phase estimation",
      "lossy interferometers",
      "indefinite photon number",
      "standard quantum limit",
      "improving phase estimation precision"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2009,
      "month": "Jul",
      "volume": 80,
      "number": 1,
      "pages": "013825"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 12,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2009PhRvA..80a3825D"
    }
  }
}