Interference of interacting matter waves

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Abstract

The phenomenon of matter-wave interference lies at the heart of quantum physics. It has been observed in various contexts in the limit of non-interacting particles as a single-particle effect. Here we observe and control matter-wave interference whose evolution is driven by interparticle interactions. In a multi-path matter-wave interferometer, the macroscopic manybody wave function of an interacting atomic Bose-Einstein condensate develops a regular interference pattern, allowing us to detect and directly visualize the effect of interaction-induced phase shifts. We demonstrate control over the phase evolution by inhibiting interaction-induced dephasing and by refocusing a dephased macroscopic matter wave in a spin-echo-type experiment. Our results show that interactions in a many-body system lead to a surprisingly coherent evolution, possibly enabling narrow-band and high-brightness matterwave interferometers based on atom lasers. © IOP Publishing Ltd and Deutsche Physikalische Gesellschaft.

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Gustavsson, M., Haller, E., Mark, M. J., Danzl, J. G., Hart, R., Daley, A. J., & Nägerl, H. C. (2010). Interference of interacting matter waves. New Journal of Physics, 12. https://doi.org/10.1088/1367-2630/12/6/065029

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