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Nonclassicality and criticality in symmetry-protected magnetic phases

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.

preprint2015arXivOpen access
Matthew J. M. PowerSteve CampbellMaria Moreno-CardonerGabriele De Chiara
cond-mat.str-elquant-ph
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Open access4 authors2 topics
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Matthew J. M. PowerSteve CampbellMaria Moreno-CardonerGabriele De Chiara

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