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Long-range quantum discord in critical spin systems

We show that quantum correlations as quantified by quantum discord can characterize quantum phase transitions by exhibiting nontrivial long-range decay as a function of distance in spin systems. This is rather different from the behavior of pairwise entanglement, which is typically short-ranged even in critical systems. In particular, we find a clear change in the decay rate of quantum discord as the system crosses a quantum critical point. We illustrate this phenomenon for first-order, second-order, and infinite-order quantum phase transitions, indicating that pairwise quantum discord is an appealing quantum correlation function for condensed matter systems.

preprint2012arXivOpen access
J. MazieroL. C. CéleriR. M. SerraM. S. Sarandy
cond-mat.stat-mechquant-ph
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J. MazieroL. C. CéleriR. M. SerraM. S. Sarandy

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