title: Entanglement of a photon and an optical lattice spin wave.
abstract: 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.
authors: School of Physics, Georgia Institute of Technology, Atlanta, Georgia 30332-0430, USA.
authors: Y O
authors: YO
authors: Dudin
authors: S D
authors: SD
authors: Jenkins
authors: R
authors: R
authors: Zhao
authors: D N
authors: DN
authors: Matsukevich
authors: A
authors: A
authors: Kuzmich
authors: T A B
authors: TA
authors: Kennedy