Erlangen 2018 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 38: Poster: Quantum Optics and Photonics I
Q 38.15: Poster
Dienstag, 6. März 2018, 16:15–18:15, Orangerie
Impact of interactions on BEC interferometry — •Christian Ufrecht, Albert Roura, Wolfgang P. Schleich, and the QUANTUS team — Institut für Quantenphysik and Center for Integrated Quantum Science and Technology (IQST), Universität Ulm, D-89069 Ulm
In recent years, light-pulse atom interferometry with macroscopic arm separation and Bose-Einstein condensates as highly coherent atom sources has attracted a lot of attention. However, interactions between the atoms, which are often disregarded in the theoretical description, can lead to significant effects such as mean-field phase shifts or phase diffusion.
To better understand these phenomena, we discuss the problem in second quantization, where the inclusion of interactions is straightforward. Based on a clear separation of the atomic clouds along different paths in position or momentum space, we propose a method that leads to a path-dependent description involving a transformation to the rest frame for each individual path. In this picture phase contributions predicted by the non-interacting theory and effects generated by the interaction separate most clearly. As an application of this method we discuss how two-mode squeezing between momentum states driven by atomic interactions can be exploited to overcome the shot-noise limit.
The QUANTUS project is supported by the German Space Agency
DLR with funds provided by the Federal Ministry of Economics and
Technology (BMWi) under grant number 50WM1556 (QUANTUS IV).