Measurement of Autler-Townes and Mollow Transitions in a Strongly Driven Superconducting Qubit

M. Baur; S. Filipp; R. Bianchetti; J. M. Fink; M. Göppl; L. Steffen; P. J. Leek; A. Blais; A. Wallraff

doi:10.1103/PhysRevLett.102.243602

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Measurement of Autler-Townes and Mollow Transitions in a Strongly Driven Superconducting Qubit

M. Baur, S. Filipp, R. Bianchetti, J. M. Fink, M. Göppl, L. Steffen, P. J. Leek, A. Blais, A. Wallraff

DOI 10.1103/PhysRevLett.102.243602 · Physical Review Letters

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Abstract

We present spectroscopic measurements of the Autler-Townes doublet and the sidebands of the Mollow triplet in a driven superconducting qubit. The ground to first excited state transition of the qubit is strongly pumped while the resulting dressed qubit spectrum is probed with a weak tone. The corresponding transitions are detected using dispersive readout of the qubit coupled off resonantly to a microwave transmission line resonator. The observed frequencies of the Autler-Townes and Mollow spectral lines are in good agreement with a dispersive Jaynes-Cummings model taking into account higher excited qubit states and dispersive level shifts due to off-resonant drives.