Comparative analysis of robust entanglement generation in engineered XX spin chains

TL;DR

This study compares two entanglement generation protocols in finite XX spin chains with different spins, finding that the dual-port architecture outperforms the staggered coupling method in fidelity, speed, and robustness against imperfections.

Contribution

The paper introduces a comprehensive numerical comparison showing the superiority of the dual-port boundary control protocol over staggered couplings in entanglement generation.

Findings

P2 achieves higher entanglement fidelity than P1.

P2 is faster in generating entanglement.

P2 is more robust against disorder and noise.

Abstract

We present a numerical investigation comparing two entanglement generation protocols in finite XX spin chains with varying spin magnitudes ($s = 1/2, 1, 3/2 $). Protocol 1 (P1) relies on staggered couplings to steer correlations toward the ends of the chain. At the same time, Protocol 2 (P2) adopts a dual-port architecture that uses optimized boundary fields to mediate virtual excitations between terminal spins. Our results show that P2 consistently outperforms P1 in all spin values, generating higher-fidelity entanglement in shorter timescales when evaluated under the same system parameters. Furthermore, P2 exhibits superior robustness under realistic imperfections, including diagonal and off-diagonal disorder, as well as dephasing noise. These advantages stem from its ability to suppress the bulk population and minimize susceptibility to decoherence. Together, the scalability, efficiency, and noise resilience of the dual-port approach position it as a promising framework for entanglement distribution in solid-state quantum information platforms.