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

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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.

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Scarlino, P., van Woerkom, D. J., Mendes, U. C., Koski, J. V., Landig, A. J., Andersen, C. K., … Wallraff, A. (2019). Coherent microwave-photon-mediated coupling between a semiconductor and a superconducting qubit. Nature Communications, 10(1). https://doi.org/10.1038/s41467-019-10798-6

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