Enhancement of pairwise entanglement from $\mathbbm{Z}_2$ symmetry breaking

Details Enhancement of pairwise entanglement from $\mathbbm{Z}_2$ symmetry breaking Enhancement of pairwise entanglement from $\mathbbm{Z}_2$ symmetry breaking

2006-08-10

arxiv.org/abs/cond-mat/0608244v2

Phys. Rev. Lett. 97, 257201 (2006)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 3 figures, revtex4. Slight modifications, few additional remarks

Scientific paper

10.1103/PhysRevLett.97.257201

We study the effect of symmetry breaking in a quantum phase transition on pairwise entanglement in spin-1/2 models. We give a set of conditions on correlation functions a model has to meet in order to keep the pairwise entanglement unchanged by a parity symmetry breaking. It turns out that all mean-field solvable models do meet this requirement, whereas the presence of strong correlations leads to a violation of this condition. This results in an order-induced enhancement of entanglement, and we report on two examples where this takes place.

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