Thermal excitation of multi-photon dressed states in circuit quantum electrodynamics - Fink, Johannes M; Baur, Matthias; Bianchetti, R; Filipp, Stefan; Göppl, M; Leek, Peter; Steffen, L.; Blais, Alexandre; Wallraff, Andreas (Physica Scripta T, 2009)
The exceptionally strong coupling realizable between superconducting qubits and photons stored in an on-chip microwave resonator allows for the detailed study of matter-light interactions in the realm of circuit quantum electrodynamics (QED). Here we investigate the resonant interaction between a single transmon-type multilevel artificial atom and weak thermal and coherent fields. We explore up to three photon dressed states of the coupled system in a linear response heterodyne transmission measurement. The results are in good quantitative agreement with a generalized Jaynes-Cummings model. Our data indicate that the role of thermal fields in resonant cavity QED can be studied in detail using superconducting circuits.
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