title: Autler-Townes effect in a superconducting three-level system.
abstract: When a three-level quantum system is irradiated by an intense coupling field resonant with one of the three possible transitions, the absorption peak of an additional probe field involving the remaining level is split. This process is known in quantum optics as the Autler-Townes effect. We observe these phenomena in a superconducting Josephson phase qubit, which can be considered an "artificial atom" with a multilevel quantum structure. The spectroscopy peaks can be explained reasonably well by a simple three-level Hamiltonian model. Simulation of a more complete model (including dissipation, higher levels, and cross coupling) provides excellent agreement with all of the experimental data.
authors.affiliation: Helsinki University of Technology, Low Temperature Laboratory, Puumiehenkuja 2B, Espoo, FIN-02015 HUT Finland. Mika.Sillanpaa@iki.fi
authors.forename: Mika A
authors.initials: MA
authors.lastname: Sillanpää
authors.forename: Jian
authors.initials: J
authors.lastname: Li
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: G S
authors.initials: GS
authors.lastname: Paraoanu
authors.forename: Pertti J
authors.initials: PJ
authors.lastname: Hakonen