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\section{Experimental Setup}  \par In this experiment we used the entanglement demonstrator provided by the firm qutools. The setup included a 405 nm laser as its input beam. [5] beam [5].  The beam then enters the spontaneous parametric down-conversion, after which two beams emerge at double the wavelength of 810 nm. At this point, the beams are split but not yet entangled. After narrowing the wavelength spread with a band pass filter, the beams go through a half wave plate, and one beam goes through an adjusting crystal to restore entanglement. The beams then passed through their respective polarizers before entering a collimator. The coincidences were measured using the quED Control and Read-out Unit using two second time integration. A diagram of the setup is shown in