Several universities in the US and Europe are known to have equipment for the double-slit experiment, often used for undergraduate demonstrations and experimental purposes. This experiment typically requires just a laser, making it accessible for many colleges and universities. Participants in the discussion mention that even smaller institutions with limited resources conduct the double-slit experiment in their physics labs, although it may not be emphasized in lectures. A specific interest is expressed in setups capable of emitting single photons, electrons, or larger molecules like buckyballs to demonstrate interference patterns, highlighting the advanced capabilities some institutions might have for more intricate quantum experiments.