Creation and manipulation of entanglement in spin chains far from equilibrium

TL;DR

This paper explores how to generate and control entanglement in spin chains using dynamic driving, aiming to improve quantum communication and state transfer in solid-state systems, while analyzing the effects of decoherence.

Contribution

It introduces a method to produce entanglement via parametric driving at resonance and proposes routing multipartite entangled states in spin networks.

Findings

Resonance conditions significantly enhance entanglement between chain ends.

Global and local driving can effectively manipulate entanglement.

Decoherence impacts entanglement robustness in the system.

Abstract

We investigate creation, manipulation, and steering of entanglement in spin chains from the viewpoint of quantum communication between distant parties. We demonstrate how global parametric driving of the spin-spin coupling and/or local time-dependent Zeeman fields produce a large amount of entanglement between the first and the last spin of the chain. This occurs whenever the driving frequency meets a resonance condition, identified as "entanglement resonance". Our approach marks a promising step towards an efficient quantum state transfer or teleportation in solid state system. Following the reasoning of Zueco et al. [1], we propose generation and routing of multipartite entangled states by use of symmetric tree-like structures of spin chains. Furthermore, we study the effect of decoherence on the resulting spin entanglement between the corresponding terminal spins.