title: Dynamical Autler-Townes control of a phase qubit.
abstract: 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.
authors.affiliation: O.V. Lounasmaa Laboratory, Aalto University, PO Box 15100, FI-00076 AALTO, Finland. jian.li@aalto.fi
authors.forename: Jian
authors.initials: J
authors.lastname: Li
authors.forename: G S
authors.initials: GS
authors.lastname: Paraoanu
authors.forename: Katarina
authors.initials: K
authors.lastname: Cicak
authors.forename: Fabio
authors.initials: F
authors.lastname: Altomare
authors.forename: Jae I
authors.initials: JI
authors.lastname: Park
authors.forename: Raymond W
authors.initials: RW
authors.lastname: Simmonds
authors.forename: Mika A
authors.initials: MA
authors.lastname: Sillanpää
authors.forename: Pertti J
authors.initials: PJ
authors.lastname: Hakonen
mesh_terms: D000465:Algorithms; D003198:Computer Simulation; D007700:Kinetics; D008956:Models, Chemical; D017785:Photons; D011789:Quantum Theory; D015203:Reproducibility of Results; D012815:Signal Processing, Computer-Assisted / Q000295:instrumentation*