Abstract
We first give a detailed account of the theory of atom interferometers based on a sequence of laser pulses pro- jecting the atomic wave packets onto a spatially separating dark superposition state. We then describe the experimen- tal realization of a multiple beam atom interferometer based on this method. In our experiment, we observe an interfer- ence signal that shows the sharply peaked Airy-function like pattern characteristic for multiple beam interference. Besides this fringe sharpening effect, we observe a further significant difference compared to the signal of a conventional two-beam atom interferometer. When the time between the beamsplit- ting pulses is varied, we observe collapse and revival of the fringe pattern, which is caused by a recoil phase shift increas- ing quadratically with the transverse atomic momentum.
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