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

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2014-05-30 - 2014-11-27

S. van Frank, A. Negretti, T. Berrada, R. Bücker, S. Montangero, J.-F.
Schaff, T. Schumm, T. Calarco, J. Schmiedmayer


Journal reference: Nature Communications 5, 4009 (2014)
DOI: 10.1038/ncomms5009
Cite as: arXiv:1402.0377 [quant-ph]

We demonstrate a two-pulse Ramsey-type interferometer for non-classical motional states of a Bose-Einstein condensate in an anharmonic trap. The control pulses used to manipulate the condensate wavefunction are obtained from Optimal Control Theory and directly optimised to maximise the interferometric contrast. They permit a fast manipulation of the atomic ensemble compared to the intrinsic decay and many-body dephasing effects, and thus to reach an interferometric contrast of 92% in the experimental implementation.