There may be different classes of quantum computers in the sense that some algorithms - including algorithms we do not yet have yet - may not execute on all the

There may be different classes of quantum computers in the sense that some algorithms - including algorithms we do not yet have yet - may not execute on all the quantum computing surfaces we have. Additionally current quantum computers are heroic devices, it may be beyond our civilization to build ones that are equivalent to a human brain - or that elucidate how any brain works.