Abstract
The supercurrent through a system of two ultrasmall Josephson junctions in series depends on the magnitude of the quantum fluctuations in the charge on the island between the two junctions. As a result of Heisenberg’s uncertainty relation, the charge fluctuations become larger when the fluctuations in the phase of the island are squeezed. In the experiment described below, the magnitude of the phase fluctuations is modulated using a SQUID that provides a tunable coupling between the island and a large superconducting reservoir. It is shown that stronger coupling leads to enhanced charge fluctuations resulting in a larger supercurrent through the system.
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