This depends - in reality all governments are going to be forced to realise what they used to think was security has all along simply been privacy - anyone who could tell what they were upto was too polite / disinterested to do so. He guy with the cottage across from XXX research centre does not care about the tail numbers of the planes landing at night.

But now every plane spotter has instant cross-correlation with every other one - and those secret flights stand out as being, well, private flights.

So long story short, if I did magically invent quantum computing, I would let the rest of the low grade secrets go hang. One of the 3 million (!) security cleared US personnel will throw Assange a copy soon enough - so lets use the advantage, to our advantage.

This of course means that if our security services have the brains and the political muscle, they will need to choose themselves which are the truly secret things and arrange a government in a government to keep it in shape. That's not likely to be a good thing.