Nanoampere pumping of Cooper pairs

TL;DR

This paper demonstrates precise control and high current levels in Cooper-pair pumping using a tunable transistor, achieving significant improvements over previous methods and approaching theoretical limits.

Contribution

It introduces a radio frequency controlled tunable Cooper-pair transistor for efficient charge pumping with high resolution and current, surpassing prior results.

Findings

Charge transferred per cycle can be controlled at single Cooper-pair resolution.

Achieved nanoampere currents are over ten times higher than previous reports.

Current approaches the theoretical maximum for the device.

Abstract

We have employed a tunable Cooper-pair transistor, the sluice, with radio frequency control to pump current over a resistive circuit. We find that the charge transferred per pumping cycle can be controlled with the resolution of a single Cooper-pair up to hundreds of pairs. The achieved nanoampere current features more than an order of magnitude improvement over the previously reported results and it is close to the theoretical maximum value for the measured sample.