Scarlino, Pasqualevan Woerkom, D. J.Mendes, U. C.Koski, J. V.Landig, A. J.Andersen, C. K.Gasparinetti, S.Reichl, C.Wegscheider, W.Ensslin, K.Ihn, T.Blais, A.Wallraff, A.2021-03-262021-03-262021-03-262019-07-0810.1038/s41467-019-10798-6https://infoscience.epfl.ch/handle/20.500.14299/176134Semiconductor qubits rely on the control of charge and spin degrees of freedom of electrons or holes confined in quantum dots. They constitute a promising approach to quantum information processing, complementary to superconducting qubits. Here, we demonstrate coherent coupling between a superconducting transmon qubit and a semiconductor double quantum dot (DQD) charge qubit mediated by virtual microwave photon excitations in a tunable high-impedance SQUID array resonator acting as a quantum bus. The transmon-charge qubit coherent coupling rate (~21 MHz) exceeds the linewidth of both the transmon (~0.8 MHz) and the DQD charge qubit (~2.7 MHz). By tuning the qubits into resonance for a controlled amount of time, we observe coherent oscillations between the constituents of this hybrid quantum system. These results enable a new class of experiments exploring the use of two-qubit interactions mediated by microwave photons to create entangled states between semiconductor and superconducting qubits.text::journal::journal article::research article