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Journal Article

Matter-wave recombiners for trapped Bose-Einstein condensates


Bücker,  Robert
Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2, 1020 Vienna, Austria;
Miller Group, Atomically Resolved Dynamics Department, Max Planck Institute for the Structure and Dynamics of Matter, Max Planck Society;

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Berrada, T., van Frank, S., Bücker, R., Schumm, T., Schaff, J.-F., Schmiedmayer, J., et al. (2016). Matter-wave recombiners for trapped Bose-Einstein condensates. Physical Review A, 93(6): 063620. doi:10.1103/PhysRevA.93.063620.

Cite as: http://hdl.handle.net/11858/00-001M-0000-002A-F413-3
Interferometry with trapped atomic Bose-Einstein condensates (BECs) requires the development of techniques to recombine the two paths of the interferometer and map the accumulated phase difference to a measurable atom number difference. We have implemented and compared two recombining procedures in a double-well-based BEC interferometer. The first procedure utilizes the bosonic Josephson effect and controlled tunneling of atoms through the potential barrier, similar to laser light in an optical fiber coupler. The second one relies on the interference of the reflected and transmitted parts of the BEC wave function when impinging on the potential barrier, analogous to light impinging on a half-silvered mirror. Both schemes were implemented successfully, yielding an interferometric contrast of ∼20% and 42% respectively. Building efficient matter-wave recombiners represents an important step towards the coherent manipulation of external quantum superposition states of BECs.