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Letter

Nature Physics 5, 105–109 (1 February 2009) | doi:10.1038/nphys1154

Nonlinear response of the vacuum Rabi resonance

Lev S. Bishop , J. M. Chow , Jens Koch , A. A. Houck , M. H. Devoret , E. Thuneberg , S. M. Girvin & R. J. Schoelkopf

On the level of single atoms and photons, the coupling between atoms and the electromagnetic field is typically very weak. By using a cavity to confine the field, the strength of this interaction can be increased by many orders of magnitude, to a point where it dominates over any dissipative process.