Abstract
We report on the application of an evolutionary algorithm (EA) to enhance performance of an ultra-cold quantum gas experiment. The production of a \(^{87}\)rubidium Bose–Einstein condensate (BEC) can be divided into fundamental cooling steps, specifically magneto-optical trapping of cold atoms, loading of atoms to a far-detuned crossed dipole trap, and finally the process of evaporative cooling. The EA is applied separately for each of these steps with a particular definition for the feedback, the so-called fitness. We discuss the principles of an EA and implement an enhancement called differential evolution. Analyzing the reasons for the EA to improve, e.g., the atomic loading rates and increase the BEC phase-space density, yields an optimal parameter set for the BEC production and enables us to reduce the BEC production time significantly. Furthermore, we focus on how additional information about the experiment and optimization possibilities can be extracted and how the correlations revealed allow for further improvement. Our results illustrate that EAs are powerful optimization tools for complex experiments and exemplify that the application yields useful information on the dependence of these experiments on the optimized parameters.
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Acknowledgments
The project was financially supported partially by the European Union via the ERC Starting Grant 278208 and partially by the DFG via SFB/TR49. D. M. is a recipient of a DFG fellowship through the Excellence Initiative by the Graduate School Materials Science in Mainz (GSC 266), F. S. acknowledges funding by Studienstiftung des deutschen Volkes, and T. L. acknowledges funding from Carl-Zeiss Stiftung.
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Lausch, T., Hohmann, M., Kindermann, F. et al. Optimizing quantum gas production by an evolutionary algorithm. Appl. Phys. B 122, 112 (2016). https://doi.org/10.1007/s00340-016-6391-2
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DOI: https://doi.org/10.1007/s00340-016-6391-2