In re a most interesting hypothesis about harnessing ZPE:
http://mtaonline.net/~hheffner/NuclearZPEtapping.pdf It strikes me that one kind of Heisenberg trap which could exist in a practical device is in an "oscillating boson", which goes from condensation and back in see-saw fashion rapidly, or from the Efimov state of said boson - and back rapidly to the non-ring. The QBEC, or quasi BEC, is a hypothetical transitory condensate, especially composed of the only unique "composite boson" in nature that might possibly condense in an oscillating fashion at high temperature - for a tiny instant of time in each cycle. This is atomic hydrogen or single H, which has the minimum of 2 fermions giving integer spin. Given that spin can be aligned magnetically across many atoms, the daunting task of aligning other properties is greatly diminished so that normal probability gives a statistical window for transitory condensation at moderate temperatures - way above absolute zero. . or not. To be continued. Jones

