Stabilized parametric Cooper-pair pumping in a linear array of coupled Josephson junctions

TL;DR

This paper proposes a robust charge pumping scheme in a linear array of Cooper-pair boxes that leverages intrinsic protection and the quantum Zeno effect to enhance current standards and reduce errors.

Contribution

It introduces a stabilized parametric Cooper-pair pumping method that intrinsically guards against errors and employs the quantum Zeno effect for improved accuracy.

Findings

The scheme effectively reduces pumping errors.

It enhances the precision of current standards.

The approach is experimentally feasible.

Abstract

We present an experimentally realizable stabilized charge pumping scheme in a linear array of Cooper-pair boxes. The system design intrinsically protects the pumping mechanism from severe errors, especially current reversal and spontaneous charge excitation. The quantum Zeno effect is implemented to further diminish pumping errors. The characteristics of this scheme are considered from the perspective of improving the current standard. Such an improvement bears relevence to the closure of the so-called measurement triangle (see D. Averin [Nature 434, 285 (2005)]).