Young's Double Slit Mystery

“Young’s Double Slit Mystery” appears when the double slit experiment was done with single photons, sent one at a time, and giving the same interference pattern as obtained with a laser beam. It is said to be fully explained in Quantum Mechanics with the concept of “superposition” of the wave function of the photon and that there is no other way to explain it. Mathematically it gives the correct answer, but, it doesn’t explain the natural process behind. The principle of “superposition” is based on the idea that a quantum system is in a superposition of many possible states. The mathematical description of the quantum superposition is what is called the “wave function” and is just a probability. For a photon traveling to the double slit, the “superposition” principle means that the photon can be anywhere in the universe \cite{Victor Toth}(Victor Toth). In consequence, with this principle, it is considered that the “wave function” of the photon has an equal probability to be at the two slits at the same time. Then, in the modeling of the double slit, there are two “wave functions” leaving the two slits at the same time. It should be noted that in doing this, there is no need for the existence of a particle! Accordingly, there is no difference with the resolution of the double slit experiment done by the wave theory of light! But, the wave theory of light is untrue and the resolution using the quantum principle of “superposition” is just mathematics. However, there should be a physical reality behind these two models, wave theory of light and quantum “superposition”, which are both supposing that two “waves” are at the two slits at the same time. And also the reality of the existence of the particle in a photon is put into question. In the following we will propose a physical process to explain the diffraction by a double slit, which needs to have two real waves at the same time at the two slits.