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Abstract: We present a scheme to generate three-mode entanglement of optical fields based on concurrent interaction with separated atomic ensembles. The inseparability criterion for multimode entanglement [Phys. Rev. A 67 (2003) 052315] is well satisfied in a wide range of relevant parameters, which is sufficient to demonstrate genuine tripartite entanglement. Unlike most of the proposals that the environment will induce decoherence, here we show that the largest correlations of the three cavity modes are insensitive to the cavity decay rate. It is also found that the best correlations can be optimized by the effective coupling constants between the cavity fields and the collective atomic operators. [Copyright &y& Elsevier]

We investigate the dynamics of quantum correlations such as entanglement and quantum discord between two noninteracting atoms, each of which is trapped inside one of two coupled cavities. We find that the cavity decay can induce both entanglement and quantum discord between the two atoms when they are initially prepared in doubly excited state. The result shows the sudden death and sudden birth of entanglement and robustness of the quantum discord to sudden death. It is also found that the doubly excited state is responsible for the sudden death of entanglement. Moreover, the sudden death of entanglement can be controlled by the intercavity hopping rate. [ABSTRACT FROM PUBLISHER]