Long-distance entanglement in spin systems

Long-distance entanglement in spin systems

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...

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Veröffentlicht in:Physical review letters 2006-06, Vol.96 (24), p.247206-247206, Article 247206
Hauptverfasser: Campos Venuti, L, Degli Esposti Boschi, C, Roncaglia, M
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creator Campos Venuti, L
Degli Esposti Boschi, C
Roncaglia, M
description 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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title Long-distance entanglement in spin systems
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