afaik the biggest difference is a logic gate can only be on or off, but a quantum bit can be on and off at the same time, so that allows for exponential multitasking or something as the technology gets better and better.
Those personal Quantum computers I was looking at a while back but are kind of like they're more for educational purposes, and like run quantum games or little logic exercises to play with on them like math blaster.
I don't know of anyone using any of them to do anything unusual but would love to find out that there are folks doing that!
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