Quantum discord in non-Markovian environments

The quantum discord dynamics of two qubits in two independent non-Markovian reservoirs has been investigated. On the condition of resonant interactions, the result shows that the quantum discord has the phenomenon of “revival”. What is more, even in the region where the entanglement is zero, the quantum discord still can reveal the quantum correlations between the two qubits. Considering the detuning, it is interesting to note that the quantum discord can be preserved when the non-Markovian and the detuning conditions are satisfied simultaneously. Finally, an intuitive physical interpretation has been given by the quasimode approach.