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Title

Beyond the Jaynes-Cummings model: circuit QED in the ultrastrong coupling regime

AuthorsNiemczyk, T.; Deppe, F.; Huebl, H.; Menzel, E. P.; Hocke, F.; Schwarz, M. J.; García-Ripoll, Juan José ; Zueco, David; Hümmer, T.; Solano, E.; Marx, A.; Gross, R.
Issue Date24-Dec-2010
AbstractIn cavity quantum electrodynamics (QED), light-matter interaction is probed at its most fundamental level, where individual atoms are coupled to single photons stored in three-dimensional cavities. This unique possibility to experimentally explore the foundations of quantum physics has greatly evolved with the advent of circuit QED, where on-chip superconducting qubits and oscillators play the roles of two-level atoms and cavities, respectively. In the strong coupling limit, atom and cavity can exchange a photon frequently before coherence is lost. This important regime has been reached both in cavity and circuit QED, but the design flexibility and engineering potential of the latter allowed for increasing the ratio between the atom-cavity coupling rate and the cavity transition frequency above the percent level. While these experiments are well described by the renowned Jaynes-Cummings model, novel physics is expected in the ultrastrong coupling limit. Here, we report on the first experimental realization of a superconducting circuit QED system in the ultrastrong coupling limit and present direct evidence for the breakdown of the Jaynes-Cummings model.
Publisher version (URL)http://dx.doi.org/10.1038/nphys1730
URIhttp://hdl.handle.net/10261/30707
DOI10.1038/nphys1730
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