Fig. 3: Evolution of visibility among many modes.
From: Massively-multiplexed generation of Bell-type entanglement using a quantum memory
Figure presents Bell state visibility \({\mathcal{V}}({x}_{{\rm{s}}},{y}_{{\rm{s}}};\ t)\) retrieved from coincidences patterns measured with a quickly changing linear MZI phase φ(k) ∝ yr ∝ ys. Presented data covers a selected range of observed wavevectors and subsequently larger memory storage times t. a–e Experimental data. f–j Visibility model best fit. Hatched regions correspond to visibility \({\mathcal{V}}\, > \,1/\sqrt{2}\approx 0.707\) yielding CHSH violation. Experimental data and model fits are averaged over four combinations of measurement ports (sr, sw) = {(+, +), (+, −), (−, +), (−, −)}. Before model fitting, experimental data is Gaussian filtered to reduce noise. Some of the raw data is also presented in Supplementary Material Sec. S5.
