As a follow up to the previous post on quantum computers, here’s an SMBC comic suggested in the comments of the linked article. I have to admit: I harboured a few of the notions this aims to disabuse.
To pull out a key sentence (as suggested in the previously mentioned comments):
In Quantum Computing, the whole idea is just to choreograph a pattern of interference where the paths leading to each wrong answer interfere descructively and cancel out, while the paths leading to the right answer reinforce each other.
When you think about it in that way, quantum computers start sounding almost like mechanical computers.