- 9,667

- 2,702

Another interesting feature of the Feynman discussion is the fact that he interprets these velocities as MACROSCOPIC velocities of an electron current in a superconductor. Since such a current is macroscopic, it suggests that it might be MEASURABLE. In fact, Feynman points out that the quantum correction to the classical acceleration is not very big EXCEPT AT THE JUNCTION BETWEEN TWO SUPERCONDUCTORS. I don't know if a measurement of that kind has already been performed (the Feynman's book is quite old), but it would be truly remarkable to look for an experimental evidence of a macroscopic effect directly related to Bohmian mechanics.

Does anybody know more about measurements of electric currents in superconductors? If yes, are they compatible with Eqs. (21.19) and (21.31), or with (21.38)?