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  • Title: Coherent microwave-photon-mediated coupling between a semiconductor and a superconducting qubit.
    Author: Scarlino P, van Woerkom DJ, Mendes UC, Koski JV, Landig AJ, Andersen CK, Gasparinetti S, Reichl C, Wegscheider W, Ensslin K, Ihn T, Blais A, Wallraff A.
    Journal: Nat Commun; 2019 Jul 08; 10(1):3011. PubMed ID: 31285437.
    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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