We have demonstrated a multiple beam atom interferometer. Atoms in a cesium atomic beam are optically pumped into a spatially separating nonabsorbing superposition state consisting of five partial beams in different Zeeman sublevels separated by a momentum of two photon recoils each. When the partial waves are spatially recombined, we observe an interference signal which shows the sharply peaked Airy pattern characteristic for multiple beam interference.
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Weitz et al. (1996) studied this question.
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