Interference of a variable number of coherent atomic sources
Giovanni Cennini, Carsten Geckeler, Gunnar Ritt, Martin Weitz
Abstract
We have studied the interference of a variable number of independently created mF=0 microcondensates in a CO2-laser optical lattice. The observed average interference contrast decreases with condensate number N. Our experimental results agree well with the predictions of a random walk model. While the exact result can be given in terms of Kluyver's formula, for a large number of sources a 1/N scaling of the average fringe contrast is obtained. This scaling law is found to be of more general applicability when quantifying the decay of coherence of an ensemble with N independently phased sources.
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