Direct transition from quantum escape to phase diffusion regime in YBaCuO biepitaxial Josephson Junctions

TL;DR

This paper demonstrates a controlled transition from quantum escape to phase diffusion in YBaCuO biepitaxial Josephson junctions, highlighting the role of dissipation and magnetic field tuning in quantum phase dynamics.

Contribution

It introduces a method to engineer junctions that enable direct transition between quantum and classical regimes, advancing understanding of phase dynamics in damped quantum systems.

Findings

Transition from quantum escape to phase diffusion observed.

Magnetic field effectively tunes the quantum crossover.

Dissipation parameters are consistently encoded in junction design.

Abstract

Dissipation encodes interaction of a quantum system with the environment and regulates the activation regimes of a Brownian particle. We have engineered grain boundary biepitaxial YBaCuO junctions to drive a direct transition from quantum activated running state to phase diffusion regime. The cross-over to the quantum regime is tuned by the magnetic field and dissipation is encoded in a fully consistent set of junction parameters. To unravel phase dynamics in moderately damped systems is of general interest for advances in the comprehension of retrapping phenomena and in view of quantum hybrid technology.