Quantum discord dynamics in the presence of initial system–bath correlations
Lin Li, Jian Zou, Bao-Ming Xu, Ting-Ting Ru, Hai Li, Bin Shao, Zhi He · Physica Scripta · 2012
We investigate the influence of the initial correlations between a two-qubit system and a family of baths on the dynamics of quantum discord of these two qubits. We show that the initial states with entanglement between the two-qubit system and the bath can prompt two qubits to gain more quantum discord. Moreover, for the initial states only with discord but null entanglement between the two-qubit system and the bath, the effects depend on whether two qubits or one of the two qubits interact with the bath. We also find that there exist some specific initial states for which the entanglement between two qubits is invariant as time evolves, but the quantum discord is not, and for some other initial states although the states evolve, both the entanglement and the quantum discord remain invariant.