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We examine the quantum correlations of spin pairs in the ground state offinite XY chains in a transverse field, by evaluating the quantum discord aswell as other related entropic measures of quantum correlations. A brief reviewof the latter, based on generalized entropic forms, is also included. It isshown that parity effects are of crucial importance for describing the behaviorof these measures below the critical field. It is also shown that thesemeasures reach full range in the immediate vicinity of the factorizing field,where they become independent of separation and coupling range. Analytical andnumerical results for the quantum discord, the geometric discord and othermeasures in spin chains with nearest neighbor coupling and in fully connectedspin arrays are also provided.

Quantum discord and related measures of quantum correlations in XY chains