Long-distance entanglement in spin systems
Quantum Physics
2007-05-23 v3 Strongly Correlated Electrons
Abstract
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.
Keywords
Cite
@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}
}
Comments
RevTex, 5 pages, 7 .eps figures Two references added in published version