Quantumness of the correlations between two qubits, coupled to a cavity field
whenever the system is open or closed, is investigated when sudden death (or birth) of the
entanglement occurs. It is found that quantum correlation not exists only in the entangled
state. It’s found that the dephasing parameters and the purity of the initial states play an
important role in the dynamics behaviors of the quantum correlations, including entanglement.
Quantumness of the correlations and entanglement, due to dephasing of the cavity, are
damped until the same their values which are contained in their initial states.