Im somewhat new to modern physics, had one introductory class in my university and because it fascinated me so much, i've watched all the leonard susskind lectures on quantum mechanics, entanglement, and particle physics on youtube on the Stanford channel. Today I noticed something strange about the double slit experiment. As far as anything I can find, it has only been performed by one individual source of particles. We know that you can slow down a source enough to make individual particles go through the slits and if you do not put a detector near the double slit to entangle the particle that you want to check to see which slit it goes through, you observe an interference pattern as if it was a wave that passed through. In the case you do put a detector there, you observe two regular bands, as if it was just a bunch of particles that pass through. Now what would happen if you have lets say 500 different sources of electrons/photons that you direct at the double slit. The moment you observe a blip on the screen behind it, you switch that source for another source. Would you still observe the interference pattern, or again 2 bands as if individual particles passed through? I cannot find an experiment like that anywhere on the internet, nor can I find HOW the particles in the experiments with individual "independent" particles are generated. This leads me to consider the real possibility that the particles of the single source are in an entangled state and maybe owe their interference pattern to that entanglement instead of to the fact that they have a supposed individual wave-particle duality. And thus if you would perform the experiment I just posed, you could potentially observe 2 bands instead of an interference pattern on screen?