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« on: May 15, 2013, 04:00:44 PM »
The particular gimmick is that modern processors are already reaching the limits of their useful speed with regards to the operations they are good at, so much so that I/O(device or memory) is going to be a bigger choke point than raw speed of operation, as well multitasking to do more on a given unit.
Quantum computing works around the major difficulties of cryptography, modeling and massively parallel problem solving, which are the main things which require more processing power than present chips can supply effectively. And quantum computing is way better at those.
As far as the home user is concerned, it would affect file compression, media playback(both by fitting more data into less space without taking more time to interpret), security(either quantum computers break traditional encryption by being able to backsolve for what would normally be insoluble due to complexity, and/or quantum cryptography makes it impossible to intercept information) and graphics(your games can now be hyper-realistic, as the operations necessary to render sunlight scattering through clouds of dust and semi opaque substances can do things the proper way rather than using shortcuts that trade detail for finishing the calculation in decent timespans)