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Phys Rev Lett. 2009 Jul 10;103(2):020505. Epub 2009 Jul 10.

Entanglement of a photon and an optical lattice spin wave.

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  • 1School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.


We propose and implement a scheme to produce long-lived entanglement between a signal field and a magnetically insensitive collective excitation in an atomic cloud cooled in a one-dimensional optical lattice. After a programmable storage time, we convert the spin-wave excitation into an idler field, and demonstrate violation of Bell's inequality for storage times in excess of 3 ms.

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