Quantum speed limits of a qubit system interacting with a nonequilibrium environment
He Zhi†, , Yao Chun-Mei, Li Li, Wang Qiong
       

The non-Markovianity as a function of λ for different spectral densities, i.e., s = 1/2, s = 1, and s = 3, respectively. Other parameters are the same as Fig. 1.