SAMOP 2021 – scientific program
PV I: Plenary Talk
Tuesday, September 21, 2021, 09:00–09:45, Audimax
Quantum fluctuation mesoscopic approach to Josephson junctions — •Fabio Benatti — Department of Physics, University of Trieste, Strada Costiera 11, I-34151 Trieste, Italy
Quantum circuits with Josephson junctions are phenomenologically modelled by non-linear oscillators. These models can be accounted for by means of the theory of quantum fluctuations applied to the so-called strong-coupling quasi-spin version of the BCS Hamiltonian. Within this formulation, suitably scaled sums of microscopic quantum degrees of freedom provide collective quantum degrees able to support Josephson currents. Their temperature dependence will be compared with the one provided by Ambegaokar and Baratoff starting form the BCS model.