Figure 3: Interference fringes in a noisy interferometer.
From: Quantum mechanical which-way experiment with an internal degree of freedom
Count rates on detectors D+ (+, black) and D− (× , red) conditioned upon detection of conjugate heralding photons from the down-conversion source as a function of the phase shift in the interferometer. Panels are labelled as μ,ν, where μ specifies polarization preparation and ν defines polarizations filtered from the two paths. Solid lines are sinusoidal fits used to determine fractional visibilities. Experimental uncertainties of count rates are smaller than the size of the symbols.
