Abstract
We report on an experiment where we observe quantum mechanical interference of vortices around an induced charge. In a specially designed sample, vortices cross along a doubly connected path. On the superconducting island enclosed by the two paths a charge can be induced by capacitive coupling to a gate. In the resistance that arises from the moving vortices we find clear oscillations as a function of gate voltage. The period of the oscillation corresponds to the single electron charge e, due to the presence of a finite amount of quasiparticles. The oscillations demonstrate quantum interference of vortices which is a manifestation of the generalized Aharonov-Casher effect.
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