Entanglement generation and perfect state transfer in ferromagnetic qubit chains

TL;DR

This paper presents a method using ferromagnetic qubit chains for entanglement generation and perfect state transfer, achieving distance-independent entanglement and optimal quantum communication.

Contribution

It introduces a scheme utilizing effective 2-qubit dynamics in a uniformly filled chain, enabling long-range quantum communication with consistent entanglement.

Findings

Entanglement is independent of transmission distance.

The scheme achieves perfect state transfer.

Long-range chains serve as efficient quantum channels.

Abstract

We propose to use ferromagnetic systems for entanglement generation and distribution together with perfect state transfer between distant parties in a qubit chain. The scheme relies on an effective 2-qubit dynamics, realized by leaving two empty sites in a uniformly filled chain. This allows long-range interacting qubit chains to serve as quantum channels for both tasks with optimal performances. Remarkably, the entanglement between sender and receiver sites is independent of both the transmission distance and of system size. This property opens new perspectives for short and mid-range quantum communication with qubit chains.