{
  "id": "quant-ph/0007014",
  "version": "v1",
  "published": "2000-07-06T00:14:16.000Z",
  "updated": "2000-07-06T00:14:16.000Z",
  "title": "Quantum coherence and interaction-free measurements",
  "authors": [
    "S. Potting",
    "E. S. Lee",
    "W. Schmitt",
    "I. Rumyantsev",
    "B. Mohring",
    "P. Meystre"
  ],
  "comment": "4 pages incl. 2 PostScript figures (.eps), LaTeX using RevTeX, submitted to Phys. Rev. A (Rapid Comm.)",
  "journal": "Phys. Rev. A 62 (2000) 060101(R)",
  "doi": "10.1103/PhysRevA.62.060101",
  "categories": [
    "quant-ph"
  ],
  "abstract": "We investigate the extent to which ``interaction-free'' measurements perturb the state of quantum systems. We show that the absence of energy exchange during the measurement is not a sufficient criterion to preserve that state, as the quantum system is subject to measurement dependent decoherence. While it is possible in general to design interaction-free measurement schemes that do preserve that state, the requirement of quantum coherence preservation rapidly leads to a very low efficiency. Our results, which have a simple interpretation in terms of ``which-way'' arguments, open up the way to novel quantum non-demolition techniques.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2000-07-06T00:14:16.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum system",
      "design interaction-free measurement schemes",
      "novel quantum non-demolition techniques",
      "measurement dependent decoherence",
      "sufficient criterion"
    ],
    "tags": [
      "journal article"
    ],
    "publication": {
      "publisher": "APS",
      "journal": "Phys. Rev. A"
    },
    "note": {
      "typesetting": "RevTeX",
      "pages": 4,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}