I am not shure that it has been demonstrated that a QM mechanis is necessarily solely of a Turing architecture. When one considers the dependancy of electron spin (for example) over distance (which happens to break the 'speed of light' limit) there is sufficient reason (to my mind) to suspect that there will be some additional funkyness going on here. Also there is the potential to use neural networks at these levels (which are not necessarily reducable to Turing models, the premise has never been proven) which coupled w/ the speed of computation considerations leaves a lot to be said for the security of all the existing 'time to crack' computations that I have seen to date. The bottem line is that this whole area is a unknown and if we persist in carrying unproven assumptions from the macro-world over into the QM model we WILL be in for a nasty surprise. I want to reiterate that I am not saying there is a threat, simply that what we know about it know is not sufficiently strong enough in the 'proof' area to carry the weight of resolution some c-punks would like to assign it. Beware, there be Ogres there...