On "Consistent Quantization of Nearly Singular Superconducting Circuits"

TL;DR

This paper critiques previous work on superconducting circuit quantization, emphasizing the importance of Kirchhoff's laws and clarifying the debate over variable choices in the presence of Josephson junctions.

Contribution

It challenges prior assumptions by analyzing the role of Kirchhoff's laws and variable definitions, providing a more consistent framework for superconducting circuit quantization.

Findings

Previous quantization methods may discard Kirchhoff's laws unjustifiably

Disputes over extended vs compact variables impact experimental and theoretical results

A more consistent quantization approach aligns better with observed data

Abstract

The analysis conducted by Rymarz and DiVincenzo (Phys. Rev. X 13, 021017 (2023)) regarding quantization of superconducting circuits is insufficient to justify their general conclusions, most importantly the need to discard Kirchhoff's laws to effect variable reductions. Amongst a variety of reasons, one source of several disagreements with experimental and theoretical results is the long-standing dispute between extended vs compact variables in the presence of Josephson junctions.