# Investigation of low temperature quantum crossover in Josephson junctions

## TL;DR

This paper reevaluates evidence for macroscopic quantum tunneling in Josephson junctions at low temperatures, using simulations and experimental data, and finds no clear signatures of a quantum crossover.

## Contribution

It provides a new analysis showing the absence of expected MQT signatures in existing experimental data, challenging previous claims.

## Key findings

- No evidence of quantum crossover in analyzed data
- Simulations match experimental distributions without MQT signatures
- Reassessment questions earlier interpretations of MQT in Josephson junctions

## Abstract

The evidence for macroscopic quantum tunneling (MQT) in Josephson junctions at low temperatures has been reassessed. Swept bias escape distributions have been modeled with an algorithm-based simulation and the results compared with data from representative published experiments. Signatures expected of a crossover to MQT are not found in the analyzed data.