1. We add here our point of view as to why Devereux's theoretical arguments are lacking. To begin with a key misconception of Devereux is the idea that there are “energy quanta” absorbed from the magnetic field giving “kicks” to the wave‐packets but as this field is static no such quanta exist. In addition his objection to the well‐accepted view of the Stern‐Gerlach (SG) process appears to be based on an objection to the understanding that the spin is a quantum degree of freedom with a discrete set of eigenstates (two for a single electron spin). When he writes the Schrödinger equation he seems to ignore the existence of this quantum degree of freedom and ascribes a classical magnetic moment to the atom. Finally his objection to the coherent splitting by a magnetic field gradient uses an argument that prevents any coherent scattering by a stationary potential. It follows that he objects to all the conclusions of quantum mechanics regarding scattering or time‐dependent problems of evolution.
2. Stern-Gerlach Interferometry with the Atom Chip
3. Coherent Stern–Gerlach momentum splitting on an atom chip
4. Analysis of a high-stability Stern–Gerlach spatial fringe interferometer