Multipartite entanglement between atoms and fields via twofold phase-dependent electromagnetically induced transparency.

Abstract: We propose a scheme to generate multipartite continuous variable atom-field entanglement via two-fold phase-dependent electromagnetically induced transparency in a five-level atomic system. Due to quantum interference, the six fields act as two collection modes to interact with the atomic ensemble. Under proper conditions, it is shown that the genuine tripartite entanglement arises between the atomic ensemble and the two collection modes. Moreover, the seven-partite Greenberger–Horne–Zeilinger entangled state included six individual field modes and the atomic ensemble is achievable. Physically, the intrinsic nonlinear interactions are responsible for the quantum correlation. The hybrid multipartite entangled state may be useful for the progress of quantum network between different objects. [Copyright &y& Elsevier]