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\par The first step after alignment was to set the apparatus to the desired state. This was done by setting the polarizations in the state's anti-correlated position and adjusting the SPDC and alignment crystal to minimize the coincidence rate. To check the quality of the entangled state, the visibility was measured, which is given by the equation  \[ V=\frac{C_{max}-C_{min}}{C_{max}+C_{min}} \]  The visibility was $V_{\psi_+}=0.910 \pm 0.015$ and $V_{\psi_-}=0.889 Poisson distribution. $V_{\psi_-}=0.889$, which was propagated using a Posson distribution for the counts.  A level this high indicates a high degree of entanglement, and so it was appropriate to continue with the experiment. Once this was done, the coincidence rate was taken for the 16 different required measurements by rotating the polarizing filters. The experimental results are shown in \ref{fig:Table 1}.