Entanglement generation between distant parties via disordered spin chains

TL;DR

This paper investigates how bipartite entanglement can be generated between distant spins connected through a disordered XY spin chain, demonstrating robustness against disorder with correlated fluctuations, which aids quantum communication.

Contribution

It reveals that end-to-end entanglement remains robust in disordered channels with strong correlations, providing new insights for designing stable quantum communication protocols.

Findings

Entanglement is robust against disorder with strong correlations.

Tuning entangling parties enhances entanglement stability.

Correlated disorder can be exploited for reliable quantum communication.

Abstract

We study the emergence of bipartite entanglement between a pair of spins weakly connected to the ends of a linear disordered $XY$ spin-1/2 channel. We analyze how their concurrence responds to structural and on-site fluctuations embodied by long-range spatially-correlated sequences. We show that the end-to-end entanglement is very robust against disorder and asymmetries in the channel provided that the degree of correlations are strong enough and both entangling parties are tuned accordingly. Our results offer further alternatives in the design of stable quantum communication protocols via imperfect channels.