On the Classical Model for Microwave Induced Escape from a Josephson Washboard Potential

TL;DR

This paper demonstrates that classical physics can accurately explain microwave-induced escape phenomena in Josephson junctions, challenging previous claims of quantum behavior based on experimental data.

Contribution

The study applies a classical model to reinterpret experimental results, questioning the need for a quantum explanation of Josephson junction escape dynamics.

Findings

Classical theory fits experimental data well

Quantum interpretation may not be necessary

Challenges previous quantum claims in Josephson junctions

Abstract

We revisit the interpretation of earlier low temperature experiments on Josephson junctions under the influence of applied microwaves. It was claimed that these experiments unambiguously established a quantum phenomenology with discrete levels in shallow wells of the washboard potential, and macroscopic quantum tunneling. We here apply the previously developed classical theory to a direct comparison with the original experimental observations, and we show that the experimental data can be accurately represented classically. Thus, our analysis questions the necessity of the earlier quantum mechanical interpretation.