Entanglement transfer via the Raman atom–cavity-field interaction

For the Raman interaction between an atom and a two-mode cavity field prepared in the state |01\rangle or |10\rangle, the atom and the field can be disentangled periodically. Such a property of Raman atom–field interaction allows the full entanglement transfer among many atoms and bimodal cavities. In the calculations, each atom is assumed to interact with its own cavity at a different time and so non-identical atoms can be treated conveniently. Entanglement sudden death is discussed too. Though atom–field interaction greatly changes the values of the concurrence for two atoms, configuration of the concurrence is almost not affected. When there is entanglement sudden death, atoms and cavities can still be entangled with one another. However, full entanglement transfer cannot be achieved for such systems with Raman atom–field interaction.