CONFUSION AND THEN UNCERTAINTY
If we are still going to have to put up with these damn quantum jumps, I am sorry that I ever had anything to do with quantum theory.
—SCHRÖDINGER TO BOHR, OCTOBER 1926
“I am convinced that you have made a decisive advance with your formulation of the quantum condition, just as I am equally convinced that the Heisenberg-Born route is off the track.” Thus Einstein wrote to Schrödinger in late April of 1926. The Heisenberg-Born route, a different approach to the “quantum conditions,” introduced the term “quantum mechanics” as a more rigorous replacement for the nebulous conceptual structure of “quantum theory.” This method had begun to bear fruit six months earlier than Schrödinger’s, and unlike his work ...