Paul Crowley

No, it doesn't work that way, because you can't combine all the histories at the end in a way which will tell you whether one of them found a solution. The only combining operator you have in the quantum universe is the "complex sum over histories" which determines the probability of a final observation going a particular way based on a sum of "amplitudes", which are probabilities represented as complex numbers. If you could use this to implement the "OR" operator, you could ask if any of the histories found a solution, thus breaking any problem in NP. But no-one's found a way to do that.

Er, does that make any sense?