Driven dynamics and rotary echo of a qubit tunably coupled to a harmonic oscillator
Journal article, 2012
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. © 2012 American Physical Society.
Author
S. Gustavsson
Jonas Bylander
Chalmers, Microtechnology and Nanoscience (MC2), Quantum Device Physics
F. Yan
P. Forn-Díaz
V. Bolkhovsky
D. Braje
G. Fitch
K. Harrabi
D. Lennon
J. Miloshi
P. Murphy
R. Slattery
S. Spector
B. Turek
T. Weir
P.B. Welander
F. Yoshihara
D.G. Cory
Y. Nakamura
T.P. Orlando
W.D. Oliver
Physical Review Letters
0031-9007 (ISSN) 1079-7114 (eISSN)
Vol. 108 17 170503-Subject Categories (SSIF 2011)
Atom and Molecular Physics and Optics
Condensed Matter Physics
DOI
10.1103/PhysRevLett.108.170503