2006/04/30 by L. Campos Venuti, C. Degli Esposti Boschi, M. Roncaglia · 1 citation
Physics and Astronomy · #cond-mat.str-el #quant-ph
paper · pdf · doi:10.1103/physrevlett.96.247206
published as Phys. Rev. Lett. 96, 247206 (2006) · RevTex, 5 pages, 7 .eps figures Two references added in published version
arxiv created 2006/06/26 · arxiv updated 2009/12/01
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.