Entanglement in finite spin rings with noncollinear Ising interaction

Details Entanglement in finite spin rings with noncollinear Ising interaction Entanglement in finite spin rings with noncollinear Ising interaction

2010-12-20

arxiv.org/abs/1012.4277v1

Physics

Quantum Physics

Scientific paper

We investigate the entanglement properties of finite spin rings, with noncollinear Ising interaction between nearest neighbours. The orientations of the Ising axes are determined either by the spin position within the ring (model A) or by the direction of the bond (model B). In both cases, the considered spin Hamiltonians have a point group symmetry, rather than a translation invariance, as in spin rings with collinear Ising interaction. The ground state of these models exhibit remarkable entanglement properties, resembling GHZ-like states in the absence of an applied magnetic field (model B). Besides, the application of an homogeneous magnetic field allows to modify qualitatively the character of the ground state entanglement, switching from multipartite to pairwise quantum correlations (both models A and B).

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