The influence of mixed classical dephasing noisy channels on the dynamics of two-qubit correlations.

In two independent local transmitting channels, we investigate the dynamics of entropy disorder, purity, and entanglement negativity in a two-qubit system with mixed static (STC) and Ornstein–Uhlenbeck (OU) noise. Because the OU and STC noises induce Markovianity and non-Markovianity in two classical channels, respectively, it is initially assumed that the two-qubit system is built in a Werner state form. Furthermore, the effect of noise, channel, and state parameters on entropy disorder, purity, and negativity in a two-qubit system has been thoroughly investigated. The dephasing effects of the mixed STC–OU noise differ significantly from the individual STC and OU noises. When influenced by the mixed STC–OU noise, the system preserves entanglement and purity by avoiding entropy over a longer time period. We find that the system can preserve quantum correlations for a longer period of time when weakly coupled to the classical field while setting the noise parameters to their least potential values. In comparison, the negativity measure has been found more effective in encountering smaller variations in entanglement. Entanglement sudden death and birth is witnessed to be regulated by the STC noise parameter and associated coupling strength of the classical field. In addition, a non-Markovian dynamical map of the system is obtained which contradicts the previous results under pure OU noise. [ABSTRACT FROM AUTHOR]