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 clas- sical 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 sensi- tive 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 be- havior 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.