Resilient superconducting-element design with genetic algorithms

TL;DR

This paper introduces a genetic algorithm-based method to design superconducting quantum circuits with specific energy spectra and transition rules, improving robustness and automation in circuit engineering for quantum computing.

Contribution

The paper presents a novel genetic algorithm approach for designing superconducting circuits with tailored energy levels and selection rules, enhancing automation and robustness.

Findings

Genetic algorithms successfully designed circuits matching target spectra and transition rules.

Multi-loop circuits achieve desired properties more accurately than single-loop circuits.

Designed circuits demonstrate robustness against parameter fluctuations.

Abstract

We present superconducting quantum circuits which exhibit atomic energy spectrum and selection rules as ladder and lambda three-level configurations designed by means of genetic algorithms. These heuristic optimization techniques are employed for adapting the topology and the parameters of a set of electrical circuits to find the suitable architecture matching the required energy levels and relevant transition matrix elements. We analyze the performance of the optimizer on one-dimensional single- and multi-loop circuits to design ladder ($\Xi$) and lambda ($\Lambda$) three-level system with specific transition matrix elements. As expected, attaining both the required energy spectrum and the needed selection rules is challenging for single-loop circuits, but they can be accurately obtained even with just two loops. Additionally, we show that our multi-loop circuits are robust under random fluctuation in their circuital parameters, i.e. under eventual fabrication flaws. Developing an optimization algorithm for automatized circuit quantization opens an avenue to engineering superconducting circuits with specific symmetry to be used as modules within large-scale setups, which may allow us to mitigate the well-known current errors observed in the first generation of quantum processors.