Spin qubits and superconducting qubits are among the promising candidates for a solid state quantum computer. For the implementation of a hybrid architecture which can profit from the advantages of either world, a coherent long-distance link is necessary that integrates and couples both qubit types on the same chip. We realize such a link with a frequency-tunable high impedance SQUID array resonator. The spin qubit is a resonant exchange qubit hosted in a GaAs triple quantum dot. It can be operated at zero magnetic field, allowing it to coexist with superconducting qubits on the same chip. We find a working point for the spin qubit, where the ratio between its coupling strength and decoherence rate is optimized. We observe coherent interaction between the resonant exchange qubit and a transmon qubit in both resonant and dispersive regimes, where the interaction is mediated either by real or virtual resonator photons.
@article{arxiv.1903.04022,
title = {Coherent long-distance spin-qubit-transmon coupling},
author = {A. J. Landig and J. V. Koski and P. Scarlino and C. Müller and J. C. Abadillo-Uriel and B. Kratochwil and C. Reichl and W. Wegscheider and S. N. Coppersmith and Mark Friesen and A. Wallraff and T. Ihn and K. Ensslin},
journal= {arXiv preprint arXiv:1903.04022},
year = {2019}
}