It seems like they are talking about an alternate set of energy states. This isn't an area I'm too well versed in, but I do know that mathematically, zero and infinity can behave similarly. I am very interested to see what comes out of this research.
I would caution that, while we are talking about some interesting phenomena, practically working in these conditions is far from a trivial task, and I imagine that a significant amount of energy is expended creating these conditions. Whether usable energy in excess of what is required to generate it can be obtained remains to be seen. I certainly wouldn't expect to see anything practical come out of this anytime soon.
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