The double-slit experiment is a well-known and widely performed experiment in the field of quantum mechanics. It is not purely theoretical but rather an experimental phenomenon that has been observed and studied extensively.
The double-slit experiment demonstrates the wave-particle duality of particles, such as electrons or photons. It involves passing particles through two closely spaced slits and observing the resulting interference pattern on a screen behind the slits. The experiment shows that particles can exhibit wave-like behavior and produce an interference pattern, suggesting that they can simultaneously exist in multiple states or locations.
The double-slit experiment has been conducted with various particles, including electrons, photons, atoms, and even larger molecules. Its results have been repeatedly observed and verified by many researchers and laboratories around the world. The experiment serves as a fundamental demonstration of the peculiar nature of quantum mechanics and has played a crucial role in shaping our understanding of the quantum world.