Long-distance entanglement in spin systems

Details Long-distance entanglement in spin systems Long-distance entanglement in spin systems

2006-04-28

arxiv.org/abs/quant-ph/0604215v3

Phys. Rev. Lett. 96, 247206 (2006)

Physics

Quantum Physics

RevTex, 5 pages, 7 .eps figures Two references added in published version

Scientific paper

10.1103/PhysRevLett.96.247206

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.

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