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Q: Fachverband Quantenoptik und Photonik
Q 25: Poster – Cold Atoms and Molecules, Matter Waves (joint session Q/A/MO)
Q 25.42: Poster
Dienstag, 11. März 2025, 14:00–16:00, Tent
Toward Magnetically Insensitive 39K BECs — •Wei Liu, Constantin Avvacumov, Alexander Herbst, Ashwin Rajagopalan, Knut Stolzenberg, Daida Thomas, Ernst Rasel und Dennis Schlippert — Leibniz Universität Hannover, Institut für Quantenoptik
The sensitivity of an atom interferometer(AI) is generally limited by the standard quantum limit (SQL). Entangled interferometer schemes generated through atom-atom interactions in a trapped configuration can surpass the SQL, thereby enhancing the sensitivity of the AIs. However, trapped AIs are constrained by phase diffusion stemming from collisions at high atomic density. Feshbach resonances can suppress phase diffusion in trapped AI by tuning scattering length, enabling measurements with high-densities and large atomnumbers. 39K BEC are ideal canidiates for such interfermetry schemes, as they feature broad resonans at low magnetic fields.
To create 39K BEC in mF = 0 suitable for AI at low field, the narrowness of resonance at 59.3G and spin-changing collision pose significant challenges for evaporative cooling. We present several schemes for generating a 39K BEC in mF = 0 through using microwave pulses and co-propagating Raman beam before and after evaporative cooling and discuss their limitations.