Mainz 2017 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 7: Ultracold atoms and BEC - I (with A)
Q 7.2: Vortrag
Montag, 6. März 2017, 15:00–15:15, N 1
Towards coherent beam splitting in a TAAP ring atom waveguide — •Hector Mas1,2, Saurabh Pandey2,3, Giannis Drougakis2,3, Patrick Navez1, Konstantinos Poulios2, Georgios Vasilakis2, Thomas Fernholz4, and Wolf von Klitzing2 — 1Department of Physics, University of Crete, Heraklion 70113, Greece — 2IESL-FORTH, Heraklion 70013, Greece — 3Department of Materials, Science and Technology, University of Crete, Heraklion 70113 — 4School of Physics and Astronomy, University of Nottingham, Nottingham NG7 2RD, United Kingdom
Trapped atom interferometers are promising candidates for improving the sensitivity of cold atom based sensing devices by means of increasing the interaction time and decreasing the size of the devices. We present progress towards a Sagnac clock type interferometer employing the two hyperfine states (F=1 and F=2) of Rubidium 87 (Rb87) in a state-dependent time averaged adiabatic potential (TAAP) ring shaped waveguide. We report on experimental advances leading to the implementation of the full interferometric sequence with a focus on achieving coherent splitting, guiding and recombination of the atomic cloud inside the waveguide. A number of decoherence processes may arise during the interferometric cycle, e.g. fluctuations in the magnetic fields or rf/microwave excitation. We will introduce and discuss preliminary measurements on both the ring waveguide characterisation and the spectroscopy of cold atoms in TAAP potentials, focusing on the search for a magic frequency that will allow for much improved coherence times.