title: Rabi oscillations in a Josephson-junction charge two-level system.
abstract: We investigated temporal behavior of an artificial two-level system driven by a strong oscillating field; namely, quantum-state evolution between two charge states in a small Josephson-junction circuit irradiated with microwaves. Rabi oscillations corresponding to 0-, 1-, and 2-photon resonances were observed. As a function of microwave amplitude, the Rabi frequencies followed a first-kind Bessel function of the corresponding order to the number of photons.
authors.affiliation: NEC Fundamental Research Laboratories, Tsukuba, Ibaraki 305-8501, Japan.
authors.forename: Y
authors.initials: Y
authors.lastname: Nakamura
authors.forename: Y A
authors.initials: YA
authors.lastname: Pashkin
authors.forename: J S
authors.initials: JS
authors.lastname: Tsai