[bawolff]

I think the current argument against them is that some people think that the error rate of qubits will grow exponentially with size of machine in such a way that the error rate will outrun the ability of error correcting codes to fix errors. (Not a quantum scientist. I probably misunderstand and i have no idea how likely it is)

> Superposition is real, the speed up will be real once it scales up.

To be clear, they only speed up very select problems. It is not a general speed up.

[tromp]

I just find it hard to believe that physical reality will let us do reliable computations with superpositions of 2^1024 states. I suspect that the theory of quantum physics is some excellent approximation of physical reality that will breakdown at such absurd levels of precision.