Applied Mathematics & Information Sciences

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The influence of a pulsed control on nonclassical correlation and entanglement is studied. To illustrate, a scheme of initially entangled noninteracting two qubits coupled independently to a couple of quantized field modes via a nonresonant Raman interaction has been proposed. Mainly, two types of measures are considered, namely, quantum discord and concurrence. We discuss how concurrence can play efficiently the same role as discord in absence of entanglement. Dynamics of states, initially, having ”X”- structure density matrix are studied to help in shedding light on this important role. We mainly focus on extended Werner-like states (EWL). We show that, for a specific EWL state, interaction induces a loss of the initial entanglement of the two qubits and it causes ”entanglement sudden death (ESD)”, while for other EWL state, the behavior of a nonclassical correlation can be easily determined from that of entanglement and vice versa. Also, regardless of EWL states type, by adjusting efficient values of specific parameters, a pulsed control of both qubits causes steady behavior of nonclassical correlation as well as entanglement. In that case, the amount of correlation between both qubits can be increased where correlation maxima can be almost reached. Our observations may have important implications in exploiting these correlations in quantum information processing and transmission.