Entanglement Distribution in Star Network Based on Spin Chain in Diamond

TL;DR

This paper proposes a spin chain-based star network architecture using nitrogen-vacancy centers in diamond, demonstrating its potential for entanglement distribution and magnetic-field gradient measurement despite noise and disorder.

Contribution

It introduces a novel spin chain architecture for star networks in diamond, analyzing entanglement limits and robustness under realistic conditions.

Findings

Entanglement depends on chain length and noise levels.

The architecture is feasible for magnetic-field gradient measurement.

Entanglement persists despite disorder and spin loss.

Abstract

Since star network of spins was proposed, generating entanglement directly through spin interactions between distant parties became much possible. We propose an architecture which involves coupled spin chains based on nitrogen-vacancy centers and nitrogen defect spins to expand star network, the numerical analysis shows that the length of spin chains $M$ and spin noise can determine the maximally achievable entanglement $E_m$. The entanglement capability of this configuration under effect of disorder and spin loss is also studied. Moreover, it is shown that with this kind of architecture, star network of spins is feasible in measurement of magnetic-field gradient.