LITTLE KNOWN FACTS ABOUT PPKTP CRYSTAL.

We have bought SPDC810 and hoped to employ polarization-entangled photons initially. But It appears this unit doesn't have polarization-entangled photons. I wonder if you could update/modify our SPDC810 to really make it emit entangled photons.Case in point: Just one PPKTP crystal may be used in a very quantum entanglement set up to create pairs of