Coherent microwave-photon-mediated coupling between a semiconductor and a superconducting qubit.

ABSTRACT: Semiconductor 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.

SUBMITTER: Scarlino P 

PROVIDER: S-EPMC6614454 | biostudies-literature | 2019 Jul

REPOSITORIES: biostudies-literature