Increasing the correlation level of polarization entangled photon pairs generated by type-II SPDC in BBO
Csaba Tamás Holló, Gábor Erdei, Tamás Sarkadi · Frontiers in Optics / Laser Science · 2020
Entangled photon sources introduce phase shift between polarization states. Exceeding coherence length, coincidence rate drops for certain bases. Correlation is restored by phase compensation. Applying anisotropic retarders coincidence rate doubles.