Gustavsson, S. and Bylander, J. and Yan, F. and Forn-Díaz, P. and Bolkhovsky, V. and Braje, D. and Fitch, G. and Harrabi, K. and Lennon, D. and Miloshi, J. and Murphy, P. and Slattery, R. and Spector, S. and Turek, B. and Weir, T. and Welander, P. B. and Yoshihara, F. and Cory, D. G. and Nakamura, Y. and Orlando, T. P. and Oliver, W. D. (2012) Driven Dynamics and Rotary Echo of a Qubit Tunably Coupled to a Harmonic Oscillator. Physical Review Letters, 108 (17). Art. No. 170503. ISSN 0031-9007 http://resolver.caltech.edu/CaltechAUTHORS:20121102-110108300
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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.
|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.|
|Group:||IQIM, Institute for Quantum Information and Matter|
|Classification Code:||PACS: 03.67.Lx, 05.40.Ca, 74.50.+r, 85.25.Cp|
|Usage Policy:||No commercial reproduction, distribution, display or performance rights in this work are provided.|
|Deposited By:||Tony Diaz|
|Deposited On:||02 Nov 2012 19:51|
|Last Modified:||27 Dec 2012 02:58|
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