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Driven dynamics and rotary echo of a qubit tunably coupled to a harmonic oscillator

S. Gustavsson ; Jonas Bylander (Institutionen för mikroteknologi och nanovetenskap, Kvantkomponentfysik) ; 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). Vol. 108 (2012), 17, p. 170503.
[Artikel, refereegranskad vetenskaplig]

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.



Denna post skapades 2016-07-27. Senast ändrad 2016-08-15.
CPL Pubid: 239581

 

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