Interference of interacting matter waves

Mattias Gustavsson, Elmar Haller, Manfred J. Mark, Johann G. Danzl, Russell Hart, Andrew J. Daley, Hanns-Christoph Nägerl

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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 many-body 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 matter-wave interferometers based on atom lasers.
Original languageEnglish
Article number065029
Number of pages11
JournalNew Journal of Physics
Publication statusPublished - 28 Jun 2010


  • neutron interferometry
  • Bose-Einstein condensate
  • atom lasers
  • matter-wave interference
  • interparticle interactions


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