Nonclassicality and criticality in symmetry-protected magnetic phases

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.

arXiv comment7 pages, 6 figures, Close to published version. Includes a link to data used for the figures

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• Quantum discord and its allies: a review
• Genuine quantum correlations in quantum many-body systems: a review of recent progress
• Quantum Correlations and Coherence in Spin-1 Heisenberg Chains
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