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We investigate pairwise correlation properties of the ground state (GS) offinite antiferromagnetic (AFM) spin chains described by the Heisenberg model.The exchange coupling is restricted to nearest neighbor spins, and is constant$J_0$ except for a pair of neighboring sites, where the coupling $J_1$ mayvary. We identify a rich variety of possible behaviors for different measuresof pairwise (quantum and classical) correlations and entanglement in the GS ofsuch spin chain. Varying a single coupling affects the degree of correlationbetween all spin pairs, indicating possible control over such correlations bytuning $J_1$. We also show that a class of two spin states constitutes exactspin realizations of Werner states (WS). Apart from the basic and theoreticalaspects, this opens concrete alternatives for experimentally probingnon-classical correlations in condensed matter systems, as well as forexperimental realizations of a WS via a single tunable exchange coupling in aAFM chain.

Quantum and classical correlations in antiferromagnetic chains and the realization of Werner states with spins