Routers, switches, and repeaters are essential components of modern information-processing systems. Similar devices will be needed in future superconducting quantum computers. In this work we investigate experimentally the time evolution of Autler-Townes splitting in a superconducting phase qubit under the application of a control tone resonantly coupled to the second transition. A three-level model that includes independently determined parameters for relaxation and dephasing gives excellent agreement with the experiment. The results demonstrate that the qubit can be used as a ON/OFF switch with 100 ns operating time-scale for the reflection/transmission of photons coming from an applied probe microwave tone. The ON state is realized when the control tone is sufficiently strong to generate an Autler-Townes doublet, suppressing the absorption of the probe tone photons and resulting in a maximum of transmission.
@article{arxiv.1103.2631,
title = {Dynamical Autler-Townes control of a phase qubit},
author = {Jian Li and G. S. Paraoanu and Katarina Cicak and Fabio Altomare and Jae I. Park and Raymond W. Simmonds and Mika A. Sillanpaa and Pertti J. Hakonen},
journal= {arXiv preprint arXiv:1103.2631},
year = {2012}
}