To the quantum mechanics specialists community it is a well-known fact that the famous original
Stern–Gerlach experiment (SGE) produces entanglement between the external degrees of freedom
(position) and the internal degree of freedom (spin) of silver atoms. Despite this fact, almost all
textbooks on quantum mechanics explain this experiment using a semiclassical approach, where the
external degrees of freedom are considered classical variables, the internal degree is treated as a
quantum variable, and Newton’s second law is used to describe the dynamics. In the literature there
are some works that analyze this experiment in its full quantum mechanical form. However,
astonishingly, to the best of our knowledge the original experiment, where the initial states of the
spin degree of freedom are randomly oriented coming from the oven, has not been analyzed yet in the
available textbooks using the Schrödinger equation (to the best of our knowledge there is only one
paper that treats…