Full control of superconducting qubits with combined XYZ lines

As the field of quantum computing proceeds to larger-scale devices, multiplexing will be crucial to scale quantum processors. While multiplexed readout is common practice for superconducting devices, relatively little work has been reported on the combination of flux and control lines. In this work, we present a method to integrate microwave lines and flux lines into a single “XYZ line” without significantly impacting the qubit relaxation time. This combined control line allows us to perform single-qubit gates in 20 ns as well as to deliver flux signals to the qubits. We benchmark the fidelity of single-qubit gates with randomized benchmarking achieving a fidelity above 99.5%.