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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. 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 one second time integration. The first step in the experiment was the arduous task of alignment using the adjusting mirrors and the fiber optic collimators. Once an optimal count rate was acheived, the adjusting crystal and SPDC crystal were vertically adjusted to align the laser in either the $\psi_+$ or $\psi_-$ state.