We propose an efficient scheme to prepare multipartite entanglement of atomic ensembles trapped in separate cavities.
Our scheme has high fidelity even with realistic noise based on the repeat-until-success strategy. By employing the
quantum memory of the atomic internal state, the scaling efficiency decreases only with the number of atomic ensembles
by a slow polynomial law. Moreover, the atomic ensembles also can function as quantum repeaters, which enable our
system to compatible with the current experimental technique for quantum communication using atomic ensembles.
"Efficient preparation of multipartite entanglement of atomic ensembles", Proc. SPIE 7846, Quantum and Nonlinear Optics, 78460L (4 November 2010); doi: 10.1117/12.866066; https://doi.org/10.1117/12.866066