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We experimentally study negative fluctuations of stochastic entropyproduction in an electronic double dot operating in nonequilibrium steady-stateconditions. We record millions of random electron tunneling events at differentbias points, thus collecting extensive statistics. We show that for all biasvoltages the experimental average values of the minima of stochastic entropyproduction lie above $-k_B$, where $k_B$ is the Boltzmann constant, inagreement with recent theoretical predictions for nonequilibrium steady states.Furthermore, we also demonstrate that the experimental cumulative distributionof the entropy production minima is bounded, at all times and for all biasvoltages, by a universal expression predicted by the theory. We also extend ourtheory by deriving a general bound for the average value of the maximum heatabsorbed by a mesoscopic system from the environment and compare this resultwith experimental data. Finally, we show by numerical simulations that theseresults are not necessarily valid under non-stationary conditions.

Extreme reductions of entropy in an electronic double dot