Cooper pair tunneling in circuits with substantial dissipation: the three-junction R-pump for single Cooper pairs
Abstract
We propose a circuit comprising a linear array of three small-capacitance superconducting tunnel junctions with miniature resistors (R > RQ = h/4e2 = 6.5 kOhm) attached to the ends of this array. Owing to the Coulomb blockade effect and the effect of dissipative environment on the supercurrent, this circuit enables the gate-controlled transfer of individual Cooper pairs. The first experiment on operating the Al-Cr Cooper pair R-pump is described.
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