[Suicide Junkie]

Well, quantum computers aren't in the infinite calculations per second range at all.

If you built an 8-qubit processor, you get 2^8 = 256 operations at the same time.
A 32-qubit processor on a 1Hz clock does the classical equivalent of 4.3 GHz. One catch is you don't get any of those results back until the whole second is over (1Hz clock), but the average over time is quite nice.