Implementations of Superconducting Circuits for Quantum Computing

Quantum circuit materials, fabrication, and measurements have been optimized over the past decade in an intricate feedback loop with system design. This has created what some refer to as the second quantum revolution. While relying on the fundamental building blocks of non-linear aluminum oxide Josephson junctions, the field has been witness to dramatic improvements in coherence every few years. This progress is spurred on as researchers incorporate knowledge from other fields and technologies such as how to identify and mitigate losses due to, e.g. two-level fluctuators in amorphous materials and contamination, to implementing large-scale circuits with multi-chip modules and new quantum limited amplifiers. In this talk we will highlight successes of the various approaches in the field to give context to some of our work at NIST on novel junction fabrication; self-aligned, planarizable lithography for resonators and amplifiers; and new packaging and superconducting film technologies to improve the scalability of the circuits and accessibility of the technology