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Paper detail

Driven dynamics and rotary echo of a qubit tunably coupled to a harmonic oscillator

We have investigated the driven dynamics of a superconducting flux qubit that is tunably coupled to a microwave resonator. We find that the qubit experiences an oscillating field mediated by off-resonant driving of the resonator, leading to strong modifications of the qubit Rabi frequency. This opens an additional noise channel, and we find that low-frequency noise in the coupling parameter causes a reduction of the coherence time during driven evolution. The noise can be mitigated with the rotary-echo pulse sequence, which, for driven systems, is analogous to the Hahn-echo sequence.

preprint2012arXivOpen access
Simon GustavssonJonas BylanderFei YanPol Forn-DíazVlad BolkhovskyDanielle BrajeGeorge FitchKhalil HarrabiDonna LennonJovi MiloshiPeter MurphyRick SlatterySteven SpectorBen TurekTerry WeirPaul B. WelanderFumiki YoshiharaDavid G. CoryYasunobu NakamuraTerry P. OrlandoWilliam D. Oliver
cond-mat.supr-conquant-ph
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Simon GustavssonJonas BylanderFei YanPol Forn-DíazVlad BolkhovskyDanielle BrajeGeorge FitchKhalil HarrabiDonna LennonJovi MiloshiPeter MurphyRick SlatterySteven SpectorBen TurekTerry WeirPaul B. WelanderFumiki YoshiharaDavid G. CoryYasunobu NakamuraTerry P. OrlandoWilliam D. Oliver

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