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S. Chen, Y.-A. Chen, B. Zhao, Z.-S. Yuan, H.-J. Schmiedmayer, J.-W. Pan:
"Demonstration of a Stable Atom-Photon Entanglement Source for Quantum Repeaters";
Physical Review Letters, 99 (2007), S. 180505-1 - 180505-4.

We demonstrate a novel way to efficiently create a robust entanglement between an atomic and a
photonic qubit. A single laser beam is used to excite one atomic ensemble and two different modes of
Raman fields are collected to generate the atom-photon entanglement. With the help of built-in quantum
memory, the entanglement still exists after 20:5 s storage time which is further proved by the violation
of Clauser-Horne-Shimony-Holt type Bell´s inequality. The entanglement procedure can serve as a
building block for a novel robust quantum repeater architecture [Zhao et al., Phys. Rev. Lett. 98,
240502 (2007)] and can be extended to generate high-dimensional atom-photon entanglements.