Figure 4
From: Realization of the first sub-shot-noise wide field microscope
Experimental noise reduction factor (NRF) and signal-to-noise ratio (SNR) as a function of the resolution in the focal (object) plane L (or equivalently as a function of the binning d of the median filter, upper scale). Red dots represent the average of the NRF in a region of the same size as the Φ object, that is 400 × 300 μm. The black dots are the SNR of the SSN images normalized to that of the direct images. For L≥15 μm, the quantum protocol has advantages. Analogously, the blue series demonstrates that the advantage of the SSN imaging with respect to the differential classical imaging is present at any spatial resolution and reaches values of more than 80%. Solid lines correspond to the quantum enhancement predicted by Equation (3a) and (3b), when the estimated values of the NRF are considered.
