title: Direct transition from quantum escape to a phase diffusion regime in YBaCuO biepitaxial Josephson junctions.
abstract: Dissipation encodes the 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 a quantum activated running state to a phase diffusion regime. The crossover to the quantum regime is tuned by the magnetic field and dissipation is described by 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.
authors.affiliation: Seconda Universitá degli Studi di Napoli, Dipartimento di Ingegneria dell'Informazione, Aversa, Italy. llongobardi@ms.cc.sunysb.edu
authors.forename: Luigi
authors.initials: L
authors.lastname: Longobardi
authors.forename: Davide
authors.initials: D
authors.lastname: Massarotti
authors.forename: Daniela
authors.initials: D
authors.lastname: Stornaiuolo
authors.forename: Luca
authors.initials: L
authors.lastname: Galletti
authors.forename: Giacomo
authors.initials: G
authors.lastname: Rotoli
authors.forename: Floriana
authors.initials: F
authors.lastname: Lombardi
authors.forename: Francesco
authors.initials: F
authors.lastname: Tafuri