Effects of dipole--dipole interaction on entanglement transfer
Effects of dipole-dipole interaction on entanglement transfer

A system consisting of two different atoms interacting with a two-mode vacuum, where each atom is resonant only with one cavity mode, is considered. The effects of dipole--dipole ({dd}) interaction between two atoms on the atom--atom entanglement and mode--mode entanglement are investigated. For a weak {dd} interaction, when the atoms are initially separable, the entanglement between them can be induced by the {dd} interaction, and the entanglement transfer between the atoms and the modes occurs efficiently; when the atoms are initially entangled, the entanglement transfer is almost not influenced by the {dd} interaction. However, for a strong {dd} interaction, it is difficult to transfer the entanglement from the atoms to the modes, but the atom--atom entanglement can be maintained when the atoms are initially entangled.