Scalable Spin-Qubit Device with a High Impedance Resonator

Developing a hybrid spin-qubit-resonator system is appealing because it enables long distance coupling and a potentially faster two-qubit gate compared to a capacitive mediated qubit-interaction. However, it is challenging to implement because it requires fabrication techniques that are compatible with both high quality resonators and gateable heterostructures. We present our results using niobium nitrate nanowire kinetic inductors as resonators coupled to singlet-triplet qubits in GaAs. After optimizing fabrication steps, resonators with quality factors of over 5000 were achieved with impedances of several thousand. Measurements of a singlet-triplet qubit proximal to the resonator reveal tunable single qubits coupled to an adjacent resonator. We detect excitations of the resonator by measuring the qubit’s splitting as a function of the drive and frequency of a microwave signal applied near the resonator’s antinode and observe that qubit splitting is resonator-dependent.