Stuttgart 2012 – wissenschaftliches Programm
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A: Fachverband Atomphysik
A 45: Kalte Atome
A 45.5: Vortrag
Freitag, 16. März 2012, 11:45–12:00, V7.02
Accelerated split-operator method for GPU simulations of 3D atomic dynamics — •Lee J. O' Riordan1,3, Neil Crowley1, Tadhg Morgan1, Thomas Fernholz2, Peter Krüger2, and Thomas Busch1,3 — 1Department of Physics, University College Cork, Ireland — 2School of Physics & Astronomy, University of Nottingham, UK — 3Quantum Systems Unit, OIST, Okinawa, Japan
Precise control over the external degrees of freedom of cold atomic systems for applications in quantum technologies often requires a fully three dimensional description. For numerical simulations this usually means large grids leading to long processing times, making highly scalable parallel approaches essential for obtaining results within useful timescales. We present a study into two sets of codes developed for the purpose of simulating the adiabatic dynamics of a single atom on a multi-waveguide atom chip. The first is a CPU approach utilising MPI and FFTW, and the second is a modern GPU-based approach. We find that the GPU approach offers a potential reduction in calculation time of up to an order of magnitude, making detailed simulations of even large structures realistic. The example we are investigating aims to show Coherent Tunneling Adiabatic Passage (CTAP) in a system of waveguides on an atom chip. Due to the absence of Rabi oscillations in this process, very large transfer fidelities can be achieved. All results we present closely mirror experimentally realistic systems and we present strategies we have developed to combat currently existing problems with other experimental approaches in order to fulfil the conditions to observe CTAP.