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Spatial interference of coherent atomic waves by manipulation of the internal quantum state

C. Fort, P. Maddaloni, F. Minardi, M. Modugno, and M. Inguscio

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Abstract

A trapped 87Rb Bose–Einstein condensate is initially put into a superposition of two internal states. Under the effect of gravity and by means of a second transition, we prepare two vertically displaced condensates in the same internal state. These constitute two coherent sources of matter waves with adjustable spatial separation. Fringe patterns, observed after free expansion, are associated with the interplay between internal and external degrees of freedom and substantially agree with those for a double-slit experiment.

© 2001 Optical Society of America

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