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arXiv · 2106.09698

Interaction-driven breakdown of dynamical localization in a kicked quantum gas

Alec Cao·Roshan Sajjad·Hector Mas·Ethan Q. Simmons·Jeremy L. Tanlimco·Eber Nolasco-Martinez·Toshihiko Shimasaki·H. Esat Kondakci·Victor Galitski·David M. Weld
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Abstract

Quantum interference can terminate energy growth in a continually kicked system, via a single-particle ergodicity-breaking mechanism known as dynamical localization. The effect of many-body interactions on dynamically localized states, while important to a fundamental understanding of quantum decoherence, has remained unexplored despite a quarter-century of experimental studies. We report the experimental realization of a tunably-interacting kicked quantum rotor ensemble using a Bose-Einstein condensate in a pulsed optical lattice. We observe signatures of a prethermal localized plateau, followed for interacting samples by interaction-induced anomalous diffusion with an exponent near one half. Echo-type time reversal experiments establish the role of interactions in destroying reversibility. These results quantitatively elucidate the dynamical transition to many-body quantum chaos, advance our understanding of quantum anomalous diffusion, and delimit some possibilities for protecting quantum information in interacting driven systems.

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Alec Cao, Roshan Sajjad, Hector Mas, Ethan Q. Simmons, Jeremy L. Tanlimco, Eber Nolasco-Martinez, Toshihiko Shimasaki, H. Esat Kondakci, Victor Galitski, David M. Weld. 2021-06-17. Interaction-driven breakdown of dynamical localization in a kicked quantum gas. https://doi.org/10.1038/s41567-022-01724-7

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