Dynamical Autler-Townes control of a phase qubit
  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. 
Jian Li, G. S. Paraoanu, Katarina Cicak, Fabio Altomare, Jae I. Park,   Raymond W. Simmonds, Mika A. Sillanpaa, and Pertti J...
cond-mat.mes-hall quant-ph