Interference between a large number of independent Bose-Einstein condensates

Interference Between a Large Number of Independent Bose-Einstein Condensates

We study theoretically the interference patterns produced by the overlap of an array of Bose-Einstein condensates that have no phase coherence among them. We show that density-density correlations at different quasimomenta, which play an important role in twocondensate interference, become negligible for large N , where N is the number of overlapping condensates. In order to understand the phys...

Interference of an array of independent Bose-Einstein condensates.

We have observed high-contrast matter wave interference between 30 Bose-Einstein condensates with uncorrelated phases. Interferences were observed after the independent condensates were released from a one-dimensional optical lattice and allowed to overlap. This phenomenon is explained with a simple theoretical model, which generalizes the analysis of the interference of two condensates.

Boolean Bose-einstein Condensates Bose-einstein Condensates

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Optimized production of large Bose Einstein Condensates

Coherent collisions between Bose-Einstein condensates.

We study the nondegenerate parametric amplifier for matter waves, implemented by colliding two Bose-Einstein condensates. The coherence of the amplified waves is shown by observing high contrast interference with a reference wave and by reversing the amplification process. Since our experiments also place limits on all known sources of decoherence, we infer that relative number squeezing is mos...