Entanglement manipulation via dynamics in multiple quantum spin systems

TL;DR

This paper explores how to manipulate and enhance entanglement between two quantum networks using their natural dynamics and local measurements, providing a topology-independent efficiency measure.

Contribution

It introduces a method to transfer, concentrate, and purify entanglement in quantum spin networks based on their free dynamics and local measurements, with a new efficiency metric.

Findings

Efficiency measure is topology-independent

Performance depends on initial entangled pairs

Protocol effectively enhances entanglement

Abstract

We study manipulation of entanglement between two identical networks of quantum mechanical particles. Firstly, we reduce the problem of entanglement transfer to the problem of quantum state transfer. Then, we consider entanglement concentration and purification based on free dynamics on the networks and local measurements on the vertices. By introducing an appropriate measure of efficiency, we characterize the performance of the protocol. We give evidence that such a measure does not depend on the network topology, and we estimate the contribution given by the number of entangled pairs initially shared by the two networks.