{
  "id": "1803.00797",
  "version": "v1",
  "published": "2018-03-02T10:32:50.000Z",
  "updated": "2018-03-02T10:32:50.000Z",
  "title": "Survival of the fittest in the coherent evolution of quantum ensembles",
  "authors": [
    "G. Liu",
    "O. Be'er",
    "Y. Margalit",
    "M. Givon",
    "D. Groswasser",
    "Y. Japha",
    "R. Folman"
  ],
  "categories": [
    "quant-ph",
    "physics.atom-ph"
  ],
  "abstract": "We report two novel effects in an ensemble of two-level systems driven by an external field. First, we observe a frequency rigidity where the dominant Rabi oscillation frequency does not change with detuning, in contrast to the well-known law according to which the Rabi frequency grows with increasing detuning of the driving field. Second, we observe a time-dependent frequency shift of the ensemble-averaged oscillation, as some frequency components decay faster than others. Hence, coherence emerges from long-lived oscillations in an inhomogeneous ensemble. Our general model shows that these effects are related to a surprising double peak structure in the frequency spectrum of the generalized Rabi frequency. We show that the effects observed in alkali vapor are universal and expected in any system with a moderate inhomogeneity driven by an external field, and set stringent limits for applications requiring accurate coherent quantum manipulation.",
  "revisions": [
    {
      "version": "v1",
      "updated": "2018-03-02T10:32:50.000Z"
    }
  ],
  "analyses": {
    "keywords": [
      "quantum ensembles",
      "coherent evolution",
      "dominant rabi oscillation frequency",
      "requiring accurate coherent quantum manipulation",
      "rabi frequency"
    ],
    "note": {
      "typesetting": "TeX",
      "pages": 0,
      "language": "en",
      "license": "arXiv",
      "status": "editable"
    }
  }
}