Experimental observation of the Poincaré-Birkhoff scenario in a driven many-body quantum system

A driven anharmonic quantum oscillator is experimentally realized with collective superposition states of an interacting two-component Bose-Einstein condensate. Probing delicate quantum fluctuations during the dynamics of the system allowed the researchers to observe the emergence of stable and unstable fixed points as predicted by the Poincare-Birkhoff theorem.

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