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Discord –entanglement interplay in the thermodynamic limit: the XY model

Batle,J; Plastino,A.; Plastino,A.R.; Casas,M.;
International Journal of Quantum Information 11, 135003 (1-13) (2013)

We investigate thermal properties of quantum correlations in the thermodynamic limit with reference to the XY-model and the finite two-qubit Heisenberg model. Although this model has been the subject of active entanglement-research, the bulk of the pertinent work refers to finite instantiations. As a consequence, the temperature cannot be properly defined in such circumstances, a problem that is overcome here. Our effort should be of interest because quantum discord notion.