Figure 3
From: Experimental demonstration of a quantum shutter closing two slits simultaneously

Interference fringe for the reflected probe photons.
The coincidences of the probe and shutter photons are plotted as a function of the phase in the probe photon interferometer. The phase is calculated from a single-photon experiment. The dashed line corresponds to the calculated counts given by the residual state. The error bars are determined by assuming that the count follows the Poisson distribution.