Brownian motion in a feedback-controlled optical trap provides a minimal experimental realization of a Szilárd engine, confirming fluctuation theorems and demonstrating the importance of spontaneous symmetry breaking in small thermodynamic systems.
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Dunkel, J. Engines and demons. Nature Phys 10, 409–410 (2014). https://doi.org/10.1038/nphys2958
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DOI: https://doi.org/10.1038/nphys2958
