title: Cavity quantum electrodynamics with separate photon storage and qubit readout modes.
abstract: We present the realization of a cavity quantum electrodynamics setup in which photons of strongly different lifetimes are engineered in different harmonic modes of the same cavity. We achieve this in a superconducting transmission line resonator with superconducting qubits coupled to the different modes. One cavity mode is strongly coupled to a detection line for qubit state readout, while a second long lifetime mode is used for photon storage and coherent quantum operations. We demonstrate sideband-based measurement of photon coherence, generation of n photon Fock states and the scaling of the sideband Rabi frequency with square root of n using a scheme that may be extended to realize sideband-based two-qubit logic gates.
authors.affiliation: Department of Physics, ETH Zurich, CH-8093, Zurich, Switzerland. leek@phys.ethz.ch
authors.forename: P J
authors.initials: PJ
authors.lastname: Leek
authors.forename: M
authors.initials: M
authors.lastname: Baur
authors.forename: J M
authors.initials: JM
authors.lastname: Fink
authors.forename: R
authors.initials: R
authors.lastname: Bianchetti
authors.forename: L
authors.initials: L
authors.lastname: Steffen
authors.forename: S
authors.initials: S
authors.lastname: Filipp
authors.forename: A
authors.initials: A
authors.lastname: Wallraff