Fig. 3: Histogram of the measured-noise distribution and the combined amplitude value at ωE as a function of the measured Fourier amplitude. | Nature Communications

Fig. 3: Histogram of the measured-noise distribution and the combined amplitude value at ωE as a function of the measured Fourier amplitude.

From: Searching for dark matter with a spin-based interferometer

Fig. 3

For an ALP field oscillating below ωE, the sidebands are not resolved, and an ALP signature is present at ωE. However, AM+K(ωE) is compatible with the expected noise distribution and thus no ALP candidates with frequencies ωa < ωE are reported. The blue arrow indicates the frequency bin at ωE, the dashed red line indicates the 95% confidence detection threshold, and the orange distribution is the measured noise for the frequency bins between ωE and 0.01 Hz. The amplitude is normalized by the standard deviation ΔAM+K(ω) to whiten the noise.

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