Figure 2
Normalized probability distributions of the particle position for various τ in the symmetric feedback scheme. The magenta open squares, orange solid circles and red open triangles correspond to τ equal to 200 μs, 2 ms, and 20 ms, respectively. The black solid triangle data correspond to the equilibrium distribution that was obtained by measuring the particle position without feedback. The solid curves are obtained by fitting the data to the normal distribution with the variance given by 2〈Ws(τ)〉/k. Inset: Plot of average work extraction per period as a function of τ. The error bars denote the standard error of the mean. The dashed horizontal line corresponds to the equilibrium potential energy kBT/2. The solid curve follows \(({k}_{B}T/2)\,[1-\exp (\,-\,\tau /{\tau }_{B})]\) with τB = 1.86 ms.
