We would like to provide an erratum to our manuscript [1] related to all-optical intensity fluctuation magnification using the Kerr effect. We realized that the last figure (Fig. 1 here) of the manuscript did not present the ratio between the contrasts of the input and output signals, but rather the ratio between the two signals amplitudes ($P_{\textrm {signal}}$). This was simply due to an error in the code processing the data. We updated the figure to properly display the ratios between the contrasts. The conclusions drawn in the manuscript, as well as the core text of the manuscript, remain identical since a magnification factor of $2m+1$ is still obtained in the small-signals regime. The updated figure is presented below. While the original figure also demonstrated the magnification of small signals, this updated figure is more in line with the mathematical derivations performed in the manuscript.

 

Fig. 1. Measurement of the magnification of small intensity fluctuations. a) Measured normalized original signal with a modulation depth of 50 mV, b) measured normalized $2^{\textrm {nd}}$ order sideband signal, c) ratios between of the output and input signal’s contrast as a function of the modulation depth of the sinusoidal signal on EOM2.

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