Rostock 2019 – scientific programme
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Q: Fachverband Quantenoptik und Photonik
Q 5: Precision Measurements and Metrology I
Q 5.7: Talk
Monday, March 11, 2019, 12:00–12:15, S SR 111 Maschb.
Symmetric atom interferometers based on double Bragg diffraction for large momentum transfer — •Jens Jenewein, Albert Roura, Wolfgang P. Schleich, and the QUANTUS team — Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm
Combined with Bloch oscillations in accelerated optical lattices, double Bragg diffraction constitutes a central element of symmetric atom interferometers reaching a large relative momentum between the two arms. Unfortunately, the diffraction inefficiencies of the double Bragg pulses are an important source of contrast loss in current experiments with this kind of interferometers. We investigate these effects in detail by numerical simulations that take into account velocity selectivity effects, off-resonant transitions and imperfect laser-beam polarisations. Both partial pulse sequences and full interferometers are analysed in order to identify the main causes of diffraction inefficiencies and optimise the interferometer contrast.
The QUANTUS project is supported by the German Space Agency DLR with funds provided by the Federal Ministry of Economics and Energy (BMWi) under grant number 50WM1556 (QUANTUS IV).