We describe a novel fabrication process for Nb/AlOx/Nb-Al/AlOx/Nb stacked Josephson junctions, which we propose as 3-terminal elements to control the quantum behaviour of Josephson complex systems. A bias current can be independently injected in the top junction, providing a fine control of the critical current of the bottom junction. The reported characterization of the device refers to data in the classical limit including measurements of the switching dynamics between metastable states of the system at different temperatures and bias conditions. At low temperature the effective dissipation of the bottom junction remains substantially unchanged when different injection currents flow in the top junction. These results are interesting to project new configurations of macroscopic quantum experiments.
Stacked Josephson Junctions in view of macroscopic quantum Experiments
Granata C;Ruggiero B;Russo M;
2001
Abstract
We describe a novel fabrication process for Nb/AlOx/Nb-Al/AlOx/Nb stacked Josephson junctions, which we propose as 3-terminal elements to control the quantum behaviour of Josephson complex systems. A bias current can be independently injected in the top junction, providing a fine control of the critical current of the bottom junction. The reported characterization of the device refers to data in the classical limit including measurements of the switching dynamics between metastable states of the system at different temperatures and bias conditions. At low temperature the effective dissipation of the bottom junction remains substantially unchanged when different injection currents flow in the top junction. These results are interesting to project new configurations of macroscopic quantum experiments.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
