the entanglement of a two-atomic system in the presence of a silver nanosphere

In this paper, we study the entanglement of two-level atoms near a spherical silver nanoparticle. by employing the von neumann equation and utilizing of the electromagnetic green’s tensor associated with a dispersive and dissipative dielectric sphere, the decay rates and the lamb shift of the atomic system are obtained. then, by using the concurrence measure, we calculate the degree of entanglement of the atomic system. we observe that the decay rates severely increase near the excitation frequency of the localized plasmon-polariton, while the concurrence value is nearly zero.