www.qutools.com quED Manual 19
Checking the Entanglement Quality (quick procedure)
While the contrast between correlation and anticorrelation for the horizontal and vertical
polarizations (HH/HV or VV/HV) usually leads to a visibility of well beyond 90 %, the contrast in
the diagonal polarizations (PP/PM and MM/PM) is a sensitive measure for the entanglement
quality one can expect. It also is much more sensitive than the S-value obtained from a bell
inequality and much faster to measure.
1. If not already inserted, put the polarizing filters into the paths of down-conversion
photons.
Figure 7: Alignment of the coupling modes using the alignment screen with the pinhole and
the engraved pinpoints.
Figure 8: Alignment helper plate. To be used only for a full alignment procedure. Remove for
normal quED operation.
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