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Journal Article

Interferometry with non-classical motional states of a Bose–Einstein condensate


Bücker,  Robert
Vienna Center for Quantum Science and Technology, Atominstitut, TU Wien, Stadionallee 2, A-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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van Frank, S., Negretti, A., Berrada, T., Bücker, R., Montangero, S., Schaff, J.-F., et al. (2014). Interferometry with non-classical motional states of a Bose–Einstein condensate. Nature Communications, 5: 4009. doi:10.1038/ncomms5009.

Cite as: http://hdl.handle.net/11858/00-001M-0000-0024-B984-F
The Ramsey interferometer is a prime example of precise control at the quantum level. It is usually implemented using internal states of atoms, molecules or ions, for which powerful manipulation procedures are now available. Whether it is possible to control external degrees of freedom of more complex, interacting many-body systems at this level remained an open question. Here we demonstrate a two-pulse Ramsey-type interferometer for non-classical motional states of a Bose–Einstein condensate in an anharmonic trap. The control sequences used to manipulate the condensate wavefunction are obtained from optimal control theory and are directly optimized to maximize the interferometric contrast. They permit a fast manipulation of the atomic ensemble compared to the intrinsic decay processes and many-body dephasing effects. This allows us to reach an interferometric contrast of 92% in the experimental implementation.