Physics – Condensed Matter – Statistical Mechanics
Scientific paper
2004-12-26
in "Quantum Computing in Solid State Systems", eds. B.Ruggiero, P.Delsing, C.Granata, Y.Pashkin, and P.Silvestrini; p.111 (Spr
Physics
Condensed Matter
Statistical Mechanics
10 pages -- to be published in proceedings from "Macroscopic Quantum Coherence and Computing", June 7-10, 2004, Naples, Italy
Scientific paper
We investigate, by experiments and numerical simulations, thermal activation processes of Josephson tunnel junctions in the presence of microwave radiation. When the applied signal resonates with the Josephson plasma frequency oscillations, the switching current may become multi-valued temperature ranges both below and above the the classical to quantum crossover temperature. Switching current distributions are obtained both experimentally and numerically at temperatures both near and far above the quantum crossover temperature. Plots of the switching currents traced as a function of the applied signal frequency show very good agreement with a simple anharmonic theory for Josephson resonance frequency as a function of bias current. Throughout, experimental results and direct numerical simulations of the corresponding thermally driven classical Josephson junction model show very good agreement.
Castellano Maria Gabriella
Chiarello Fabio
Cirillo Matteo
Cosmelli Carlo
Grønbech-Jensen Niels
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