Entanglement propagation through spin chains in the presence of a staggered magnetic field

TL;DR

This paper investigates how a staggered magnetic field influences entanglement transfer in XY spin chains, revealing conditions for improved transfer and effects of anisotropy on quantum information transmission.

Contribution

It introduces analysis of entanglement dynamics in spin chains with staggered fields, highlighting potential for enhanced quantum communication compared to uniform fields.

Findings

Staggered fields can improve entanglement transfer conditions.

Exchange anisotropy negatively impacts entanglement propagation.

Multiple entanglement waves can be transmitted simultaneously.

Abstract

We study the dynamics of entanglement in the XY spin chain subject to a staggered magnetic field and contrast it to the previously studied uniform field case. We find that, depending on parameter values, a staggered field can provide better conditions for a perfect entanglement transfer, while even a modest amount of exchange anisotropy appears to have a strong detrimental effect. We also study interactions between different waves of entanglement and assess the possibility of simultaneous transmission of multiple bits of quantum information.