Abstract
In systems of Josephson junctions where the charging energy is of the same order of magnitude as the Josephson coupling energy, it is equally natural to describe the system in terms of the charge on the junction capacitors or in terms of the gauge invariant phase difference across the junction. A changing gauge invariant phase difference implies motion of flux quanta across the junction. By analysing a double junction in terms of these moving flux quanta a parallel can be drawn with a 2D Josephson junction array through which vortices move. The influence of an induced charge can in both systems be attributed to quantum interference of flux quanta.
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