Coherent superconducting quantum pump

TL;DR

This paper presents a method for fast, coherent charge pumping in a superconducting system using pulsed quantum manipulations, with relaxation used to improve accuracy.

Contribution

It introduces a non-adiabatic, coherent quantum pump that leverages pulsed control and relaxation for improved speed and error correction in superconducting charge transfer.

Findings

Achieved rapid charge pumping limited by Josephson energy.

Demonstrated that relaxation can reset the pump and reduce errors.

Validated experimental results with theoretical models.

Abstract

We demonstrate non-adiabatic charge pumping utilizing a sequence of coherent oscillations between a superconducting island and two reservoirs. Our method, based on pulsed quantum state manipulations, allows to speedup charge pumping to a rate which is limited by the coupling between the island and the reservoirs given by the Josephson energy. Our experimental and theoretical studies also demonstrate that relaxation can be employed to reset the pump and avoid accumulation of errors due to non-ideal control pulses.