Rotation of Bloch sphere induced by Lamb shift in open two-level systems*
Wang Guo-Youa),b), Tang Ninga),b), Liu Yinga),b), Zeng Hao-Shenga),b)†
       
Non-Markovianity as a function of detuning. The non-Markovianity is represented by 𝓝1 in the left of the crossing point, while it is represented by 𝓝2 in the right of the crossing point. The crossing point is an intrinsic sudden-changing point of non-Markovianity. The parameters are λ = 0.1 ω 0, , and .