In the double slit experiment, photons of light are repeatedly projected into a metal plate which has two parallel slits. The photons which pass through one of the slits then hit a detector which measures exactly where they collide. According to classical physics, one would expect the distribution of detected collisions to be the sum of the distributions resulting from either slit alone. However, we observe that the resulting distribution follows an interference pattern, where in some positions we are even less likely to detect a collision than if the plate had only one slit. Quantum mechanics explains this observation by saying that the photon exists in a superposition of having passed through the left slit or the right slit.
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