Experimental nonlocal and surreal Bohmian trajectories... 5 years after the question: Bohmian Mechanics takes a giant step forward... (my paraphrase) advances.sciencemag.org/content/2/2/e1501466

It's now 3 years later, and I thought those reading this might find this link informative: Experimental nonlocal and surreal Bohmian trajectories. Abstract: Weak measurement allows one to empirically determine a set of average trajectories for an ensemble of quantum particles... We entangle two photons and determine a set of Bohmian trajectories for one of them using weak measurements and postselection. We show that the trajectories seem surreal only if one ignores their manifest nonlocality. advances.sciencemag.org/content/2/2/e1501466

What is the "Phase 180° addition chamber? I mean, is there such a device, and if so, what is the make and model? I don't know of one. (will/am reading Princeton article in answer). I'm presuming the splitters are all 'classical phase shifting' type. Anyway, @user65452 this isn't an Ideal venue for you and I to continue this discussion from a previous video post, it is not a forum. In addition the video in question from MIT used a Michelson interferometer with extra legs, an entirely different animal. My apologies to the moderators

Precludes, as in impossible. Truly, as in totally perpetual. Even planetary orbits decay eventually, Picking nits over a general concept that something that will run for a lifetime is considered perpetual enough. Not even the universe, as a closed system, is truly perpetual. The same holds for the concept of "free" energy, in two ways. One, free as in costs nothing. And free as in able to do work so cheaply to almost cost nothing. 1st: improbable, 2nd exists in magnets and charged batteries. So the concept is maligned.