Full control of superconducting qubits with combined on-chip microwave and flux lines

As the field of quantum computing progresses to larger-scale devices, multiplexing will be crucial to scale quantum processors. While multi-plexed readout is common practice for superconducting devices, relatively little work has been reported about the combination of flux and microwave control lines. Here, we present a method to integrate a microwave line and a flux line into a single "XYZ line." This combined control line allows us to perform fast single-qubit gates as well as to deliver flux signals to the qubits. The measured relaxation times of the qubits are comparable to state-of-the-art devices employing separate control lines. We benchmark the fidelity of single-qubit gates with randomized benchmarking, achieving a fidelity as high as 99.9360.04%, and we demonstrate that XYZ lines can in principle be used to run parametric entangling gates. Published under an exclusive license by AIP Publishing.