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Circuit QED with a Nonlinear Resonator : ac-Stark Shift and Dephasing

We have performed spectroscopic measurements of a superconducting qubit dispersively coupled to a nonlinear resonator driven by a pump microwave field. Measurements of the qubit frequency shift provide a sensitive probe of the intracavity field, yielding a precise characterization of the resonator nonlinearity. The qubit linewidth has a complex dependence on the pump frequency and amplitude, which is correlated with the gain of the nonlinear resonator operated as a small-signal amplifier. The corresponding dephasing rate is found to be close to the quantum limit in the low-gain limit of the amplifier.

preprint2011arXivOpen access
F. R. OngM. BoissonneaultF. MalletA. Palacios-LaloyA. DewesA. C. DohertyA. BlaisP. BertetD. VionD. Esteve
cond-mat.mes-hallquant-ph
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F. R. OngM. BoissonneaultF. MalletA. Palacios-LaloyA. DewesA. C. DohertyA. BlaisP. BertetD. VionD. Esteve

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