"A little positive charge, much weaker than the electron charge, but there'll be a little positive image there. And then the electron will naturally be bound to its own image. It'll just see that positive charge and kind of want to move toward it, but it can't get to it, because the helium is completely chemically inert, there are no free spaces for electrons to go."
"By now, a handful of technologies are leading contenders for producing a useful quantum computer. Companies have used them to build machines with dozens to hundreds of qubits, the error rates are coming down, and they've largely shifted from worrying about basic scientific problems to dealing with engineering challenges. Yet even at this apparently late date in the field's development, there are companies that are still developing entirely new qubit technologies, betting the company"
Multiple qubit technologies are emerging as contenders for useful quantum computers. Companies have built machines with dozens to hundreds of qubits while reducing error rates. The focus has shifted from basic scientific questions to engineering challenges. Some firms continue to develop entirely new qubit platforms pursuing breakthroughs that could enable late-stage scaling. EeroQ described a qubit approach based on single electrons floating on liquid helium. An electron near the helium surface induces a weak positive image charge in the liquid and becomes bound to that image without penetrating due to helium's chemical inertness. Liquid helium remains fluid up to about 4 Kelvin, which relaxes refrigeration demands and creates a naturally clean low-pressure environment.
Read at Ars Technica
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