# Dispersion Suppressed Topological Thouless Pumping

## TL;DR

This paper introduces two methods to suppress wave-packet dispersion in Thouless pumping, enhancing its practicality for matter transport and quantum communication by making the process more localized and stable.

## Contribution

It proposes a re-localization echo protocol and a high-order tunneling suppression protocol to effectively eliminate dispersion in Thouless pumping.

## Key findings

- Re-localization echo cancels dynamical phase differences.
- High-order tunneling suppression flattens the band and reduces dispersion.
- Methods enable dispersionless Thouless pumping for practical use.

## Abstract

In Thouless pumping, although non-flat band has no effects on the quantization of particle transport, it induces wave-packet dispersion which hinders the practical applications of Thouless pumping. Indeed, we find that the dispersion mainly arises from the dynamical phase difference between individual Bloch states. Here we propose two efficient schemes to suppress the dispersion in Thouless pumping: a re-localization echo protocol and a high-order tunneling suppression protocol. In the re-localization echo protocol, we reverse the Hamiltonian in the second pumping cycle to cancel the dynamical phase difference arising from non-flat band, so that the dispersed wave-packet becomes re-localized. In the high-order tunneling suppression protocol, we modulate the nearest-neighbor tunneling to make the Bloch band more flat and suppress the high-order tunneling which causes wave-packet dispersion. Our study paves a way toward the dispersionless Thouless pumping for practical applications in matter transport, state transfer and quantum communication.