Bipartite quantum features influenced by pure and mixed disorders

Abstract This study explores quantum features, namely negativity, quantum-memory entropic uncertainty, entropic coherence, and linear entropy in a two-qubit mixture system comprising two Bell states under various classical environments. Furthermore, we assume including pure noise (colored pink, colored brown, Gaussian) and mixed noise (brown-Gaussian, pink-Gaussian) characterizing the classical environments. The influence of the purity parameter of the system along with the inclusive noise parameters is systematically analyzed. The entropic coherence and negativity functions remain sensitive to the noise showing larger revivals compared to the quantum-memory and coherence functions. The interplay between different types of noise leads to interesting dynamics, such as the suppression of Gaussian noise’s Markovian behavior by non-Markovian brown noise. Interestingly, the non-Markovian traits of pink noise are highly suppressed when combined with Gaussian noise. Besides, in mixed noise scenarios, non-regular fluctuations contrast with regular revivals in pure noise cases. The brown-Gaussian mixed noise case reveals the suppression of Gaussian noise’s Markovian behavior by non-Markovian brown noise, influencing overall dynamics. Notably, this scenario shows slight entanglement generation, unusual under classical environments, highlighting unique dynamics in mixed noise scenarios.