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Published April 27, 2012 | Submitted + Published
Journal Article Open

Driven Dynamics and Rotary Echo of a Qubit Tunably Coupled to a Harmonic Oscillator

Gustavsson, S.
Bylander, J.
Yan, F.
Forn-Díaz, P.
Bolkhovsky, V.
Braje, D.
Fitch, G.
Harrabi, K.
Lennon, D.
Miloshi, J.
Murphy, P.
Slattery, R.
Spector, S.
Turek, B.
Weir, T.
Welander, P. B.
Yoshihara, F.
Cory, D. G.
Nakamura, Y.
Orlando, T. P.
Oliver, W. D.
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Abstract

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.

Additional Information

© 2012 American Physical Society. Received 7 November 2011; published 27 April 2012. We thank M. Gouker, X. Jin, and M. Neeley for helpful discussions and technical support. K. H. gratefully acknowledges the support of RIKEN and KFUPM (DSR FT100009). This work was sponsored in part by the U.S. Government, the Laboratory for Physical Sciences, the U.S. Army Research Office (W911NF-12-1-0036), the National Science Foundation (PHY-1005373), the Funding Program for World-Leading Innovative R&D on Science and Technology (FIRST), NICT Commissioned Research, MEXT kakenhi ''Quantum Cybernetics.'' Opinions, interpretations, conclusions, and recommendations are those of the author(s) and are not necessarily endorsed by the U.S. Government.

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Published - PhysRevLett.108.170503.pdf

Submitted - 1201.6341v1.pdf

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