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- W4297242564 abstract "Quantum interference can limit energy absorption in a continually kicked system through a single-particle ergodicity-breaking mechanism known as dynamical localization1,2. The effect of many-body interactions on dynamically localized states, although important to a fundamental understanding of quantum decoherence, has remained unexplored despite more than two decades of experimental studies3–5. Here we report the experimental realization of a kicked quantum rotor ensemble with tunable interactions using a Bose–Einstein condensate in a pulsed optical lattice. We observe a clear breakdown of dynamical localization due to interactions, but the resulting dynamics do not restore classical chaotic behaviour, instead displaying sublinear anomalous diffusion. Moreover, 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 and advance our understanding of quantum anomalous diffusion, with implications on the protection of quantum information in interacting driven systems. Periodic kicking of a quantum system leads to dynamical localization and to the failure of thermalization. Measurements on a kicked Bose–Einstein condensate now show how many-body interactions induce the breakdown of dynamical localization." @default.
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- W4297242564 date "2022-09-26" @default.
- W4297242564 modified "2023-10-14" @default.
- W4297242564 title "Interaction-driven breakdown of dynamical localization in a kicked quantum gas" @default.
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- W4297242564 doi "https://doi.org/10.1038/s41567-022-01724-7" @default.
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