A quantum system can undergo tunnelling even without a barrier to tunnel through. The latest experiments visualize this process in exquisite detail, completely reconstructing the state of the evolving system.
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Steck, D. Passage through chaos. Nature 461, 736–737 (2009). https://doi.org/10.1038/461736a
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DOI: https://doi.org/10.1038/461736a
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