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Light-shift-induced behaviors observed in momentum-space quantum walks

Over the last decade there have been many advances in studies of quantum walks (QWs) including a momentum-space QW recently realized in our spinor Bose-Einstein condensate system. This QW possessed behaviors that generally agreed with theoretical predictions; however, it also showed momentum distrib...

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Main Authors: Bolik, Nikolai (Author) , Groiseau, Caspar (Author) , Clark, Jerry H. (Author) , Gresch, Alexander (Author) , Dadras, Siamak (Author) , Summy, Gil S. (Author) , Liu, Yingmei (Author) , Wimberger, Sandro (Author)
Format: Article (Journal)
Language:English
Published: 7 September 2022
In: Physical review
Year: 2022, Volume: 106, Issue: 3, Pages: 1-8
ISSN:2469-9934
DOI:10.1103/PhysRevA.106.033307
Online Access:Resolving-System, lizenzpflichtig, Volltext: https://doi.org/10.1103/PhysRevA.106.033307
Verlag, lizenzpflichtig, Volltext: https://link.aps.org/doi/10.1103/PhysRevA.106.033307
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Author Notes:Nikolai Bolik, Caspar Groiseau, Jerry H. Clark, Alexander Gresch, Siamak Dadras, Gil S. Summy, Yingmei Liu, and Sandro Wimberger

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520 |a Over the last decade there have been many advances in studies of quantum walks (QWs) including a momentum-space QW recently realized in our spinor Bose-Einstein condensate system. This QW possessed behaviors that generally agreed with theoretical predictions; however, it also showed momentum distributions that were not adequately explained by the theory. We present a theoretical model which proves that the coherent dynamics of the spinor condensate is sufficient to explain the experimental data without invoking the presence of a thermal cloud of atoms as in the original theory. Our numerical findings are supported by an analytical prediction for the momentum distributions in the limit of zero-temperature condensates. This current model provides more complete explanations to the momentum-space QWs that can be applied to study quantum search algorithms and topological phases in Floquet-driven systems. 
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