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Abstract
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Entanglement and Discord are highly complex
phenomenon, and of great importance in quantum theory because
of its various applications in quantum information processing.
Because of this, here, we study and analyze both of them
according to two coupled two-level atoms with a single-mode
quantized electromagnetic field in a cavity via the degenerate twophoton
transition. We consider the entire system of atom-field in
a thermal equilibrium with an environment and analysis the
effect of the temperature on these correlations. The effect of
atom-atom and Kerr–type couplings in quantum discord and
entanglement between the atoms is studied as well. As a result, it
has been shown that the quantum discord decreases
asymptotically to zero when the temperature increases. The
results also indicate that the entanglement suddenly disappears
during the evaluation, however the quantum discord remains
non-zero. Then the quantum discord is considered as an indicator
of disentanglement.
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