title: Observation of quantum oscillations between a Josephson phase qubit and a microscopic resonator using fast readout.
abstract: We have detected coherent quantum oscillations between Josephson phase qubits and critical-current fluctuators by implementing a new state readout technique that is an order of magnitude faster than previous methods. These results reveal a new aspect of the quantum behavior of Josephson junctions, and they demonstrate the means to measure two-qubit interactions in the time domain. The junction-fluctuator interaction also points to a possible mechanism for decoherence and reduced fidelity in superconducting qubits.
authors.affiliation: National Institute of Standards and Technology, 325 Broadway, Boulder, CO 80305, USA.
authors.forename: K B
authors.initials: KB
authors.lastname: Cooper
authors.forename: Matthias
authors.initials: M
authors.lastname: Steffen
authors.forename: R
authors.initials: R
authors.lastname: McDermott
authors.forename: R W
authors.initials: RW
authors.lastname: Simmonds
authors.forename: Seongshik
authors.initials: S
authors.lastname: Oh
authors.forename: D A
authors.initials: DA
authors.lastname: Hite
authors.forename: D P
authors.initials: DP
authors.lastname: Pappas
authors.forename: John M
authors.initials: JM
authors.lastname: Martinis