{
  "id": "0712.1616",
  "version": "v1",
  "published": "2007-12-11T14:18:02.000Z",
  "updated": "2007-12-11T14:18:02.000Z",
  "title": "Unambiguous comparison of ensembles of quantum states",
  "authors": [
    "Michal Sedlak",
    "Mario Ziman",
    "Vladimir Buzek",
    "Mark Hillery"
  ],
  "comment": "7 pages, 3 figures",
  "journal": "Phys. Rev. A 77, 042304 (2008)",
  "doi": "10.1103/PhysRevA.77.042304",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We present a solution of the problem of the optimal unambiguous comparison of two ensembles of unknown quantum states (psi_1)^k and (psi_2)^l. We consider two cases: 1) The two unknown states psi_1 and psi_2 are arbitrary states of qudits. 2) Alternatively, they are coherent states of a harmonic oscillator. For the case of coherent states we propose a simple experimental realization of the optimal \"comparison\" machine composed of a finite number of beam-splitters and a single photodetector.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2007-12-11T14:18:02.000Z"
    }
  ],
  "analyses": {
    "subjects": [
      "03.67.-a",
      "42.50.Ex"
    ],
    "keywords": [
      "coherent states",
      "simple experimental realization",
      "unknown quantum states",
      "harmonic oscillator",
      "optimal unambiguous comparison"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Physical Review A",
      "year": 2008,
      "month": "Apr",
      "volume": 77,
      "number": 4,
      "pages": "042304"
    },
    "note": {
      "typesetting": "TeX",
      "pages": 7,
      "language": "en",
      "license": "arXiv",
      "status": "editable",
      "adsabs": "2008PhRvA..77d2304S"
    }
  }
}