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Q: Fachverband Quantenoptik und Photonik

Q 20: Quantum Gases I

Q 20.5: Poster

Tuesday, March 15, 2022, 16:30–18:30, P

A Digital Micromirror Device setup for the simulation of spatially curved spacetimes in a two-dimensional BEC — Marius Sparn, Celia Viermann, Maurus Hans, Nikolas Liebster, •Elinor Kath, Helmut Strobel, and Markus Oberthaler — Kirchhoff Institut für Physik, University of Heidelberg, Germany

Analog quantum simulation on a cold atom platform can be used to study a wide variety of cosmological effects like Hawking or Unruh radiation in the lab [1]. We present an implementation which allows for simulation of quantum fields in arbitrarily curved spacetimes in 2+1 dimensions. In our potassium-39 Bose-Einstein condensate the mean field background density determines the spacetime for the quantum field of phononic excitations. Different spatial curvatures can be simulated by preparing the corresponding density profile. This is implemented with the help of a Digital Micromirror Device (DMD), which precisely shapes the intensity profile of a blue detuned dipole trap within the two-dimensional plane. This allows for arbitrary density profiles and their manipulation during an expansion of the metric, which is implemented by a change of the atomic interaction strength. [1] Jiazhong Hu et al., Nature 15, 785-789 (2019).