title: Catch-disperse-release readout for superconducting qubits.
abstract: We analyze a single-shot readout for superconducting qubits via the controlled catch, dispersion, and release of a microwave field. A tunable coupler is used to decouple the microwave resonator from the transmission line during the dispersive qubit-resonator interaction, thus circumventing damping from the Purcell effect. We show that, if the qubit frequency tuning is sufficiently adiabatic, a fast high-fidelity qubit readout is possible, even in the strongly nonlinear dispersive regime. Interestingly, the Jaynes-Cummings nonlinearity leads to the quadrature squeezing of the resonator field below the standard quantum limit, resulting in a significant decrease of the measurement error.
authors.affiliation: Department of Electrical Engineering, University of California, Riverside, California 92521, USA. esete@ee.ucr.edu
authors.forename: Eyob A
authors.initials: EA
authors.lastname: Sete
authors.forename: Andrei
authors.initials: A
authors.lastname: Galiautdinov
authors.forename: Eric
authors.initials: E
authors.lastname: Mlinar
authors.forename: John M
authors.initials: JM
authors.lastname: Martinis
authors.forename: Alexander N
authors.initials: AN
authors.lastname: Korotkov