Parallel quantized charge pumping

TL;DR

This paper demonstrates that operating two quantized charge pumps in parallel enhances current output accuracy at higher frequencies, with potential applications in quantum information, photon generation, neural networks, and electrical standards.

Contribution

The work introduces a parallel pumping scheme that improves current accuracy at high frequencies, surpassing limitations of single-pump systems.

Findings

Parallel pumps achieve higher current with maintained accuracy.

Accuracy of quantization is <20 ppm at 108.9 pA with magnetic field.

Scheme benefits quantum technologies and electrical standards.

Abstract

Two quantized charge pumps are operated in parallel. The total current generated is shown to be far more accurate than the current produced with just one pump operating at a higher frequency. With the application of a perpendicular magnetic field the accuracy of quantization is shown to be $< $20 ppm for a current of $108.9 $pA. The scheme for parallel pumping presented in this work has applications in quantum information processing, the generation of single photons in pairs and bunches, neural networking and the development of a quantum standard for electrical current. All these applications will benefit greatly from the increase in output current without the characteristic decrease in accuracy as a result of high-frequency operation.