In these experiments, the fractal shows up in the phase space maps for different induced 'kick strengths', which is related to the decoherence rate, (or degree of entanglement), as the transition from quantum to classical behaviours occurs.
A quantum mechanical system can still be viewed as interacting with the surrounding environment via entanglement, and can be shown to be sensitive to the degree of externally imposed changes.
The feedback mechanism occurs during the transition.
Interesting stuff.
Cheers
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