Well established as a process platform for manufacturing parametric amplifiers [1], we will delve into the recent findings in the implementation of superconducting tunnel junction-based qubits utilizing native aluminum oxide as sidewall passivation [2]. This innovative approach has demonstrated promising results in terms of qubit coherence and scalability, paving the way for more efficient quantum computing architectures.
Additionally, we will discuss how Trilayer based components, such as Josephson arbitrary waveform synthesisers, are utilized in the optical control of cryogenic quantum technologies [3] This approach aims to reduce the excessive heat conduction of electrical wiring, thereby enabling scalable electrical quantum technology beyond 1000 qubits.
Furthermore, we will discuss recent progress in electronic refrigeration using trilayer junctions, where for the first time we have been able to demonstrate tunnel-current-driven electron temperature reduction from 2.4 K to below 1.6 K (34% relative cooling) against the phonon bath [4].
By combining insights from both qubit, cryoelectronics, and cooler research, this talk aims to provide an overview of the opportunities and challenges in leveraging Nb-AlOx-Al trilayer junctions for scalable quantum technologies. We will also address the technical hurdles and potential solutions for integrating these junctions into large-scale quantum processors and other quantum technologies.