Nonclassicality and criticality in symmetry-protected magnetic phases
Quantum Physics
2015-06-09 v3 Strongly Correlated Electrons
Abstract
Quantum and global discord in a spin-1 Heisenberg chain subject to single-ion anisotropy (uniaxial field) are studied using exact diagonalisation and the density matrix renormalisation group (DMRG). We find that these measures of quantum nonclassicality are able to detect the quantum phase transitions confining the symmetry protected Haldane phase and show critical scaling with universal exponents. Moreover, in the case of thermal states, we find that quantum discord can increase with increasing temperature.
Keywords
Cite
@article{arxiv.1504.01569,
title = {Nonclassicality and criticality in symmetry-protected magnetic phases},
author = {Matthew J. M. Power and Steve Campbell and Maria Moreno-Cardoner and Gabriele De Chiara},
journal= {arXiv preprint arXiv:1504.01569},
year = {2015}
}
Comments
7 pages, 6 figures, Close to published version. Includes a link to data used for the figures