KEYNOTE: Scaling CMOS Spin Qubit Quantum Processors Using Superinductors

Quantum computers are nearing the thousand-qubit mark, with research and industry focusing on further scaling up to achieve computational advantage over classical computers. However, as quantum processors increase in size, new challenges arise, such managing qubit variability, and providing large scale qubit control and readout. Spin qubits in CMOS quantum dots are a promising qubit technology with demonstrated high control and readout fidelities. This qubit technology aims to address the variability challenge by leveraging the high yield large-scale fabrication capabilities of the CMOS platform, and the wiring bottleneck by integrating qubits and electronics monolithically. In this talk, we present a solution to the challenge of scaling high-fidelity qubit readout by utilizing superinductors fabricated in an industrial CMOS process. First, we present our results on the DC, RF, and thermal characterization of these superinductors. Next, we showcase the use of these devices within a radio-frequency single-electron transistor (RF-SET) setup. This approach achieves state-of-art SNR charge sensing in a circuit with a footprint comparable to a qubit dimensions. Finally, we discuss broader applications for CMOS superinductors, such as the realization of high-performance parametric circuits. Our results highlight the role of superinductors as key scalability enablers for CMOS spin qubit processors.