Driven dynamics and rotary echo of a qubit tunably coupled to a harmonic oscillator
Superconductivity
2012-05-01 v1 Quantum Physics
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.
Keywords
Cite
@article{arxiv.1201.6341,
title = {Driven dynamics and rotary echo of a qubit tunably coupled to a harmonic oscillator},
author = {Simon Gustavsson and Jonas Bylander and Fei Yan and Pol Forn-Díaz and Vlad Bolkhovsky and Danielle Braje and George Fitch and Khalil Harrabi and Donna Lennon and Jovi Miloshi and Peter Murphy and Rick Slattery and Steven Spector and Ben Turek and Terry Weir and Paul B. Welander and Fumiki Yoshihara and David G. Cory and Yasunobu Nakamura and Terry P. Orlando and William D. Oliver},
journal= {arXiv preprint arXiv:1201.6341},
year = {2012}
}