Hello, I was studying the Bell-state quantum eraser and saw that they placed quarter-wave plates in front of each slit to mark the photons with either clockwise polarization or counterclockwise polarization that were previously either horizontally or vertically polarized. So, now I'm wondering if light polarized in opposite circular polarizations can even form a diffraction pattern. And, what about photons polarized with the same circular polarizations? Can they interfere? For instance, can two clockwise polarized photons interfere and create a diffraction pattern?