If you don't understand quantum computers, just imagine a bunch of identical classical computers running in parallel.
Take the outputs of all those classical computers, and mix them together, such that you can only tell what the blended output is.
That is a quantum computer.
To keep it simple imagine 3 computers only put out 8 bits, which could represent one letter in ascii.
Computer 1 -> 0100 0001 (A)
Computer 2 -> 0100 0010 (B)
Computer 3 -> 0100 0011 (C)
Quantum -> 0100 00??
Our simple quantum computer would tell us we know the 0100 00 with 100% certainty.
For the right most bits we would know that they are both 1 75% of the time, and 0 25% of the time.
So with quantum computers, we get the advantage of being able to run software in parallel on many computers. Kind of like a massive GPU.
But on the downside, all the outputs get blended together in a probability distribution. You don't get to know what each computer came up with, just the average of the outputs of all the computers together.
