Long-distance entanglement in spin systems
量子物理
2007-05-23 v3 强关联电子
摘要
Most quantum system with short-ranged interactions show a fast decay of entanglement with the distance. In this Letter, we focus on the peculiarity of some systems to distribute entanglement between distant parties. Even in realistic models, like the spin-1 Heisenberg chain, sizable entanglement is present between arbitrarily distant particles. We show that long distance entanglement appears for values of the microscopic parameters which do not coincide with known quantum critical points, hence signaling a transition detected only by genuine quantum correlations.
关键词
引用
@article{arxiv.quant-ph/0604215,
title = {Long-distance entanglement in spin systems},
author = {L. Campos Venuti and C. Degli Esposti Boschi and M. Roncaglia},
journal= {arXiv preprint arXiv:quant-ph/0604215},
year = {2007}
}
备注
RevTex, 5 pages, 7 .eps figures Two references added in published version