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In this paper we
discuss two measures for the quantumness of correlations (quantum discord and
entanglement) of two isolated moving atoms which are initially in Werner state.
We compare and analyze the effect of the atomic motion in quantum discord and
entanglement. The results show that the atomic motion related to the field mode
structure parameter can make the entanglement and quantum discord evolve
periodically. The results also indicate that the entanglement suddenly disappears
during the evaluation but quantum discord remains non zero, so quantum discord
is considered as indicator of disentanglement.
We investigate the quantum discord of a two-qubit anisotropy XXZ Heisenberg chain with Dzyaloshinskii-Moriya (DM) interaction under magnetic field. It is shown that the quantum discord highly depends on the system’s temperature T, DM interaction D, homogenous magnetic field B and the anisotropy Δ. For lower temperature T, by modulating D and B, the quantum discord can be controlled and the quantum discord switch can be realized.