Tailoring transport in quantum spin chains via disorder and collisions

TL;DR

This paper explores how disorder and collisional noise influence transport in quantum spin chains, revealing universal localization features and potential for tailored transport protocols in quantum and biological systems.

Contribution

It introduces a stochastic collision model to analyze localization-delocalization transitions, highlighting the role of interactions and noise in transport dynamics.

Findings

Space-homogeneous collisions create localization plateaus.

Interactions enhance delocalization even at low disorder.

Universal features observed in plateau duration and delocalization time.

Abstract

We systematically investigate the interplay of disorder and time-homogeneous collisional noise in shaping the transport dynamics of an anisotropic XXZ spin chain. Using stochastic collision models to simulate interaction with the environment, we explore the localization-delocalization transitions across regimes with single and multiple excitations. We find that space-homogeneous and low-rate collisions can shape regions where localization sets in the form of subsequent plateaus. The localization process has universal features for the plateaus duration and the delocalization time. Interactions among the excitations favor this process even for tiniest disorder levels. Our findings can be applied to design stroboscopic protocols where sequences of transport and localization can be tailored. We establish relevant connections to noise-engineering of quantum devices in noisy intermediate-scale quantum simulators platforms, and to realistic biological systems where noise and disorder coexist.