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

Abstract

As the field of quantum computing progresses 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 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-art devices employing separate control lines. We benchmark the fidelity of single-qubit gates with randomized benchmarking, achieving a fidelity above 99.5%, and we demonstrate that XYZ lines can in principle be used to run parametric entangling gates.

5 pages, 4 figures

References in corpus (9)

• Supplementary information for "Quantum supremacy using a programmable superconducting processor"
• Strong quantum computational advantage using a superconducting quantum processor
• Decoherence benchmarking of superconducting qubits
• Quantum walks on a programmable two-dimensional 62-qubit superconducting processor
• Unsupervised Machine Learning on a Hybrid Quantum Computer
• Control and readout of a superconducting qubit using a photonic link
• Microwaves in Quantum Computing
• Characterizing and optimizing qubit coherence based on SQUID geometry
• Frequency Division Multiplexing Readout and Simultaneous Manipulation of an Array of Flux Qubits