Abstract
The macroscopic quantum interference effects in the ballistic Josephson microstructures are investigated. The studied system comprises four bulk superconductors (terminals) which are weakly coupled through a mesoscopic rectangular normal metal layer (two-dimensional electron gas). We show that nonlocal electrodynamics of ballistic systems lead to specific current–phase relations for the mesoscopic multiterminal Josephson junction. The nonlocal coupling of supercurrents produces a “dragging” effect for phases of the superconducting order parameter in different terminals. The composite Josephson junction, based on this effect, exhibits the two-level system behaviour controlled by the external magnetic flux. The effect of magnetic flux transfer in a system of nonlocally coupled superconducting rings is also studied.
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