Abstract

We propose a novel scheme to realize atomic quantum motion, single-mode waveguiding, and coherence propagation by using a blue-detuned TE01 doughnut mode in a hollow metallic waveguide (HMW). In this scheme, ultracold atoms can not only be guided in the dark region of the TE01 mode in the HMW (which will suffer the minimal light shift and the lowest spontaneous emission loss), but also retain some advantages of dark hollow beam atomic guiding (which has a larger hollow radius and a higher vacuum). Our study shows that if the incident angle of the ultracold atoms of Bose–Einstein condensation (BEC) is very small and the deviation of the trapping frequency of the BEC from one of the HMWs is very small, the ultracold atoms may remain in the initial coherent state in the course of atomic coupling from the BEC to the HMW. The ground mode of the matter wave and the degree of first- (or second-) order coherence of guided ultracold atoms can be unchanged during propagation in the straight HMW and almost unchanged for several 10-cm propagation distances with a curvature radius 1.5m in the curved HMW.

© 2008 Optical Society of America

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