Dipole Coupling of a Double Quantum Dot to a Microwave Resonator

Peter Leek (1)

co-authors: T Frey (2), M Beck (2), A Blais (3), T Ihn (2), K Ensslin (2), A Wallraff (2)

(1) Department of Physics, University of Oxford, UK
(2) Department of Physics, ETH Zurich, Switzerland
(3) Département de Physique, Université de Sherbrooke, Canada

We demonstrate the realization of a hybrid solid-state quantum device, in which a semiconductor double quantum dot is dipole coupled to the microwave field of a superconducting coplanar waveguide resonator. The double dot charge stability diagram extracted from measurements of the amplitude and phase of a microwave tone transmitted through the resonator is in good agreement with that obtained from transport measurements. Both the observed frequency shift and linewidth broadening of the resonator are explained considering the double dot as a charge qubit coupled with a strength of several tens of MHz to the resonator.