Berlin 2014 – scientific programme

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Q: Fachverband Quantenoptik und Photonik

Q 12: Quantum gases: Bosons, mixtures and spinor gases

Q 12.2: Talk

Monday, March 17, 2014, 14:15–14:30, UDL HS2002

Compact strongly interacting quantum mixtures for preci- sion atom interferometry — •Katerine Posso-Trujillo, Holger Ahlers, Christian Schubert, Naceur Gaaloul, and Ernst M. Rasel — Institute of Quantum Optics, Leibniz University, Welfengarten 1, 30167 Hanover, Germany

We present a preparation scheme of a binary quantum mixture for performing a high resolution quantum test of the Einstein equivalence principle based on atom interferometers, where coherent wave packets travel up to 10 seconds in free fall. As case study species, the isotopes 87Rb and 85Rb are considered. An exact calculation of the non-linear expansion dynamics of the mixture is performed by solving a system of coupled Gross-Pitaevskii equations contrasted to the results of a scaling approach theory. The latter is generalized for the case of binary mixtures and its relevance is discussed for the regimes of weak and strong interactions. The effects of a common delta-kick cooling stage, computed using experimentally accessible parameters, are analysed and demonstrate the possibility of creating ultra-slow degenerate mixture expansions (below 100 pK temperature equivalent). Leading systematic effects relevant to differential atom interferometry are discussed and mitigation strategies found for the proposed source.