Entanglement of two two-level atoms trapped in coupled cavities with a Kerr medium

In this paper, the entanglement dynamics of two two-level atoms trapped in coupled cavities with a Kerr medium is investigated. We find that the phenomena of entanglement sudden death (ESD) and entanglement sudden birth (ESB) appear during the evolution process. The influences of initial atomic states, Kerr medium, and cavity–cavity hopping rate on the atom–atom entanglement are discussed. The results obtained by the numerical method show that the atom–atom entanglement is strengthened and even prevented from ESD with increasing cavity–cavity hopping rate and Kerr nonlinearity.