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Phys Rev Lett. 2009 Jun 19;102(24):243602. Epub 2009 Jun 19.

Measurement of Autler-Townes and Mollow transitions in a strongly driven superconducting qubit.

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  • 1Department of Physics, ETH Zurich, CH-8093 Zurich, Switzerland.


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.

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