Geometric Landau-Zener interferometry in a superconducting charge pump

TL;DR

This paper introduces a novel interferometry method leveraging geometric phases in a driven two-level system, demonstrated through a superconducting charge pump, revealing interference patterns in pumped charge despite decoherence.

Contribution

It presents a new geometric Landau-Zener interferometry approach and its implementation in superconducting charge pumps, highlighting observable interference effects.

Findings

Interference patterns depend on pumping frequency and phase bias.

Interference effects persist despite realistic decoherence.

Demonstrates potential for precise control in quantum systems.

Abstract

We propose a new type of interferometry, based on geometric phases accumulated by a periodically driven two-level system undergoing multiple Landau-Zener transitions. As a specific example, we study its implementation in a superconducting charge pump. We find that interference patterns appear as a function of the pumping frequency and the phase bias, and clearly manifest themselves in the pumped charge. We also show that the effects described should persist in the presence of realistic decoherence.