A recent numerical study of short chains found near-perfect quantum state transfer between the boundary sites of a spin-1/2 XX chain if a sufficiently strong magnetic field acts on these sites. We show that the phenomenon is based on a pair of states strongly localized at the boundaries of the system and provide a simple quantitative analytical explanation.
@article{arxiv.1111.2686,
title = {Perfect state transfer in XX chains induced by boundary magnetic fields},
author = {Thorben Linneweber and Joachim Stolze and Götz S. Uhrig},
journal= {arXiv preprint arXiv:1111.2686},
year = {2012}
}
Comments
Revised version, accepted for publication in Int. J. Quant. Inf