Global quantum correlations in finite-size spin chains
Abstract
We perform an extensive study of the properties of global quantum correlations in finite-size one-dimensional quantum spin models at finite temperature. By adopting a recently proposed measure for global quantum correlations [C. C. Rulli, and M. S. Sarandy, Phys. Rev. A, 84, 042109 (2011)], called global discord, we show that critical points can be neatly detected even for many-body systems that are not in their ground state. We consider the transverse Ising model, the cluster-Ising model where three-body couplings compete with an Ising-like interaction, and the nearest-neighbor XX Hamiltonian in transverse magnetic field. These models embody our canonical examples showing the sensitivity of global quantum discord close to criticality. For the Ising model, we find a universal scaling of global discord with the critical exponents pertaining to the Ising universality class.
Keywords
Cite
@article{arxiv.1301.7114,
title = {Global quantum correlations in finite-size spin chains},
author = {S. Campbell and L. Mazzola and G. De Chiara and T. J. G Apollaro and F. Plastina and Th. Busch and M. Paternostro},
journal= {arXiv preprint arXiv:1301.7114},
year = {2013}
}
Comments
8 pages, 8 figures, RevTeX4, Published Version