Hi! We will make a lab analogous to the stern gerlach experiments but with polarized light. How can we get only one single photon in experiment with a coherent light source? I'm going to make a lab where we need to get in only one single photo at a time. I have read that you can use some inhomogeneous crystals to get a very small fraction of the photos. But how do you really do ?? What confuses me is that a laser has, for example, 10mW, only here, we have basically 10 ^ 15 photons (in order of magnitude) per second. How do you stop all photos and get through a single photo? I'm grateful for answers.