Entanglement sudden death and influence of the dynamical Stark shift for two Tavis–Cummings atoms

Abstract

The time dependence of the entanglement for two Tavis–Cummings atoms with dynamical Stark shift is studied. It is shown that the influence of the dynamical Stark shift is not equivalent for different Bell states. Namely for the states ϕ = 1 2 ( | 00 〉 ± | 11 〉 ) sudden death of entanglement happens, while for the states ψ = 1 2 ( | 01 〉 ± | 10 〉 ) we still have a rest of entanglement. A direct relation between the sudden death of entanglement and the values of the dynamical Stark shift is shown. The fidelity of the system is evaluated.