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An On-Chip Atom Interferometer Using a Bose-Einstein Condensate

TitleAn On-Chip Atom Interferometer Using a Bose-Einstein Condensate
Publication TypeThesis
Year of Publication2005
AuthorsWang, Y-J

This work reports the first demonstration of an on-chip atom Michelson interferometer employing a Bose-Einstein condensate (BEC). An intra-waveguide optical standing wave serves to split, reflect, and recombine the BEC while the BEC is con- fined and propagates in a magnetic waveguide. The combined optical beamsplitter and magnetic waveguide employed here have allowed us to study the coherence properties of matter waves confined in a microstructure.

To prove that the interferometer is successfully working, a differential phase shift is introduced between the two arms of the interferometer with a magnetic field gradient and alternatively with an initial condensate velocity in a trap with a longitudinal frequency of 5 Hz. We observe interference when the round-trip propagation time is relatively short, i.e., less than about 10 ms, and the maximum separation of the split wave packets is about 120 μm.

This thesis also introduces an alternative way of making a BEC by surface-induced evaporative cooling. The surface-induced cooling provides a promising technique, which can be potentially used for a continuous coherent source on the chip.