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Bulletin of the American Physical Society

Driven dynamics of a qubit tunably coupled to a harmonic oscillator

Simon Gustavsson, Jonas Bylander, Fei Yan, P. Forn-Díaz, Vlad Bolkhovsky, Danielle Braje, S. J. Spector, Ben Turek, Paul B. Welander, Fumiki Yoshihara, David G. Cory, Yasunobu Nakamura, William D. Oliver

Published Feb 29, 2012• 0 citations
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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.