The Retarding Effect of Noise on Entanglement Sudden Death

In this paper, we consider a system of two atoms in which one atom is in a JC cavity under the influence of a random phase telegraph noise and the other is an isolated atom. We obtain an exact solution to the time evolution of this system to investigate the effects of noise on the entanglement dynamics of the atoms. We show that the noise causes entanglement sudden death without recovery in a finite time interval. The time for this is independent of the initial state of the pure entangled atomic state. Moreover, an intensive noise delays the entanglement sudden death.