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

Author(s)
Gustavsson, Simon; Bylander, Jonas; Yan, Fei; Forn-Diaz, P.; Bolkhovsky, Vladimir; ... Show more
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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.
Date issued
2012-04
URI
http://hdl.handle.net/1721.1/71621
Department
Lincoln Laboratory; Massachusetts Institute of Technology. Department of Nuclear Science and Engineering; Massachusetts Institute of Technology. Research Laboratory of Electronics
Journal
Physical Review Letters
Publisher
American Physical Society
Citation
Gustavsson, S. et al. “Driven Dynamics and Rotary Echo of a Qubit Tunably Coupled to a Harmonic Oscillator.” Physical Review Letters 108.17 (2012). © 2012 American Physical Society
Version: Final published version
ISSN
0031-9007
1079-7114
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