LITTLE KNOWN FACTS ABOUT PPKTP CRYSTAL.

We have now purchased SPDC810 and hoped to work with polarization-entangled photons initially. But it seems this device doesn't have polarization-entangled photons. I ponder if you could potentially update/modify our SPDC810 to really make it emit entangled photons.Example: A single PPKTP crystal can be utilized in a very quantum entanglement setup