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

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

2010-10-29

arxiv.org/abs/1010.6248v3

Phys. Rev. Lett. 106, 167002 (2011)

Physics

Condensed Matter

Mesoscale and Nanoscale Physics

Paper : 4 pages, 3 figures; Supplementary material : 1 page, 1 figure

Scientific paper

10.1103/PhysRevLett.106.167002

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.

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