This is just my theory/oppinion, i don't know what really goes on or what respectable scientists believe.
Quantum computers do have the potential to take the place of transistors; however, human technology has a long way to go before quantum computers can completely take over, and believe me... quantum computers are just about the final step as far as computer hardware evolution is concerned... theoretically a quantum computers power depends on how clever a programmer is, with potentially infinite amounts of processing power. In a way a brain is like a kind of quantum computer with the way that its biological properties have influence over the quantum vaccume fluctuations. On the quantum level, there is a thing called hilbert space, which is a kind of energy which passes through different outcomes of the same universe. These outcomes and possibilities are travelling in waves which go off in opposite directions of eachother and then reunite, theres a whole bunca these things. Its like a quantum does multiple outcomes due to effects from hilbert space (a place outside of all of these universes that appears to be composed of an infinite amount of energy taking up an infinite amount of space. Things happen on a sort of cycle dictated by the laws of physics of a particular universe. An example is like, if u were a quantum particle, and u lived a normal human life, u might stop reading this now and do something else, and also keep reading. My point is that even if u did either, there are certain fundamental schedules that you still follow. You still will probably wake up from bed at roughly the same time the next day most likely because not only may you use an alarm clock, your biology needs a certain amount of sleep. In the quantum world there are simular schedules that are dictated by a giant equation that is only a kind of estimate and is very very long that describes an "alpha" of a particular universe... the laws of physics can also change from universe to universe and within a universe over time they also can change; however, the parrellel universes that overlap with this one on the quantum level are wrapped tightly around this one... and in a sense are part of this one- its what causes such a massive amount of stability quantum physics, in terms of a universe- alot of people think quantum physics is really insane and hard to understand why it works the way it does when really it works the way it does in order that "possible" things happen, while impossible things don't. Impossible things are like impossible shapes, for example try drawing a picture without any form of instrament to mark the paper. That is sort of what its like, trying to draw a universe without a special universe drawing marker and artist. The main idea or thesis of this paragraph, is that while different outcomes occur simultaniously for one particle, the end result of those two different outcomes can be the same. You stop reading this sooner, but you still wake up tommarow morning at the exact same time... and over time the waves reunite. This is just my theory and opinion, i don't really know what is going on or what scientists think.
Quantum computers becomming practical is a long way off for humans. Before they even get there they have to get to the atomic level... sure they can proove they work so far and utilize them to an extent, but not without a good deal of $$$ + they arn't optimized for much anything now other than proof that they work and experimentation to further learn more about quantum physics. Its definitely not like blowing up an atomic bomb... you can't have a theory like e=mc^2 and then smash a few atoms and you have a quantum computer, a true quantum computer that utilizes its amazing potential, would be alot like configuring an atomic bomb to explode and then output to some viewer a very accurate answer to pi or some extremely ridiculously large prime number (unimaginable amounts of digits! Trying to take all that energy and organize its displacement is far more difficult than just having alot of POWER, it requires alot of knowledge and sitting down and figuring out solutions to all of the problems we must overcome in order to facilitate such powerful potentials.
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