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

• URL: http://arxiv.org/abs/2106.09698v2
• Date: Wed, 13 Oct 2021 04:43:39 GMT
• Title: Interaction-driven breakdown of dynamical localization in a kicked quantum gas
• Authors: 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
• Abstract summary: Quantum interference can terminate energy growth in a continually kicked system, via a single-particle ergodicity-breaking mechanism known as dynamical localization. We report the experimental realization of a tunably-interacting kicked quantum rotor ensemble using a Bose-Einstein condensate in a pulsed optical lattice. 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 systems.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• 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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