3 ms·

Bohmian mechanics is very obscure. It is explicitly non-relativistic (unlike the universe we live in), and sometimes predics very weird trajectories: https://ww

• BoiledCabbage 7y ago
  You link to a paper (ESSW) that walked through a theoretical experiment that they claimed would show it as being non-relativistic, the paper actually argues it was "surrealistic", not "non-relativistic". That said they don't actually perform the experiment, they just claim it would falsify things. They don't get to claim something is false because they think it would happen if they did the experiment. Actually do the experiment and see what happens. > A real experiment along these lines appears feasible, as all components of the apparatus have been realized separately; for details consult Appendix A. The purpose of the proposed experiment is to verify the predicted quantum theoretical correlations: Whenever an atom hits the screen in the lower region A, the upper detector says "yes" - and likewise for the upper region B and the lower detector. Since we know that (some of) the retrodicted Böhm trajectories pass through the other detector, this verification suffices to demonstrate the asserted metaphysical character of the Böhm trajectories. Now all of that said, a group actually did the experiment and showed that they only way someone would incorrectly conclude the trajectories were surrealistic would be if they mistakenly ignored the non-local nature of their behavior. They actually performed an experiment and demonstrated the results. https://advances.sciencemag.org/content/2/2/e1501466.full https://advances.sciencemag.org/content/2/2/e1501466.full > We have verified the effect pointed out by ESSW that for a WWM with a delayed readout, Bohmian trajectories originating at the lower slit may be accompanied by WWM results associated with either the upper or the lower slit. However, this surreal behavior is merely the flip side of the nonlocality we also demonstrated. In Fig. 3, we showed that the trajectory of photon 1 depends on the choice of measurement (polarization basis) for photon 2. In Fig. 4, we see that the polarization of photon 2 depends on the choice of when (that is, at what point along the trajectory) to measure the position of photon 1. This nonlocality is due to the entanglement of the two photons, which, in Bohmian mechanics, makes their evolution inseparable even when the photons themselves are separated. Because entanglement is necessary for the delayed measurement scenario of ESSW, this nonlocal behavior is to be expected and is the reason for the surreal behavior they identify. Indeed, our observation of the change in polarization of a free space photon, as a function of the time of measurement of a distant photon (along one reconstructed trajectory), is an exceptionally compelling visualization of the nonlocality inherent in any realistic interpretation of quantum mechanics. Essentially the claim in the paper you linked was incorrect, and experimentally demonstrated to be so.