Transitions in an artificial atom, driven non-adiabatically through an energy-level avoided crossing, can be controlled by carefully engineering the driving protocol. We have driven a superconducting persistent-current qubit with a large-amplitude, radio-frequency field. By applying a bi-harmonic waveform generated by a digital source, we demonstrate a mapping between the amplitude and phase of the harmonics produced at the source and those received by the device. This allows us to image the actual waveform at the device. This information is used to engineer a desired time dependence, as confirmed by detailed comparison with simulation.
@article{arxiv.0812.4670,
title = {Pulse calibration and non-adiabatic control of solid-state artificial atoms},
author = {Jonas Bylander and Mark S. Rudner and Andrey V. Shytov and Sergio O. Valenzuela and David M. Berns and Karl K. Berggren and Leonid S. Levitov and William D. Oliver},
journal= {arXiv preprint arXiv:0812.4670},
year = {2011}
}