I am a physicist, but this topic is out of my particular field...
This appears to be the crucial point, buried near the end of the article:
Physicists have always been content to think of the wave function as a mathematical device with observable consequences. But Maris believes the time has come for the idea to be grounded in reality. For the electron bubbles in helium, he says, the size of the bubble is determined by how much of the wave function is trapped inside the bubble. If there is no part of the wave function inside the bubble, the bubble will collapse. "This makes the wave function seem to be a tangible object," he argues.
The current popular interpretation of the electron (or any other particle) wavefunction --at least, the way I learned it -- is as a "probability wave", whose squared amplitude gives you the probability that the particle will be found at that place upon measurement. Basically what it seems Maris is proposing is that the wavefunction is more "real" (for lack of a better word) than that, and can be split up by carefully choosing and tweaking its surroundings.
If his claims prove true, then it ought to be possible to chop the electron into any fractional bits you like, simply by exciting it into higher energy states which would assume more exotic spatial distributions, then "squeezing" the bits apart as before.
On the other hand, the skeptic in me believes the notion is an application of a flawed interpretation of the nature of the wavefunction. I think Maris realizes this though, and it seems to be a no-risk position to take. In other words, "Hey, everyone thinks this is what the wavefunction really is, but what if it isn't -- not that I'm making any claims, mind you?"
Now, I'm no low-temp guy and I don't understand the specific physics involved, so I could be way off base. But that's the way it looks to me.
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