title: Approaching unit visibility for control of a superconducting qubit with dispersive readout.
abstract: In a Rabi oscillation experiment with a superconducting qubit we show that a visibility in the qubit excited state population of more than 95% can be attained. We perform a dispersive measurement of the qubit state by coupling the qubit non-resonantly to a transmission line resonator and probing the resonator transmission spectrum. The measurement process is well characterized and quantitatively understood. In a measurement of Ramsey fringes, the qubit coherence time is larger than 500 ns.
authors.affiliation: Department of Applied Physics, Yale University, New Haven, Connecticut 06520, USA.
authors.forename: A
authors.initials: A
authors.lastname: Wallraff
authors.forename: D I
authors.initials: DI
authors.lastname: Schuster
authors.forename: A
authors.initials: A
authors.lastname: Blais
authors.forename: L
authors.initials: L
authors.lastname: Frunzio
authors.forename: J
authors.initials: J
authors.lastname: Majer
authors.forename: M H
authors.initials: MH
authors.lastname: Devoret
authors.forename: S M
authors.initials: SM
authors.lastname: Girvin
authors.forename: R J
authors.initials: RJ
authors.lastname: Schoelkopf