content: Currently, we have a roughly 50 qb processor with Google's Josephson Junction architecture, and even that takes extreme amounts of power and cooling to regulate to stability.   DWave is already at 2,000+ bits for abdiatic quantum annealing, which is not true general quantum computing but is dramatically faster at factoring problems (and any other optimization problem, due to how it uses annealing to find highly probable minima solutions). They use a relatively simple system of superconducting niobium rings at 15mK which can have current flow in both directions at once, and Johnson Junctions to act as buses selecting local quantum minimums. It's way more scalable than traditional general QC, and they claim to predict "Rose's Law" which is even faster than Moore's law (http://www.33rdsquare.com/2012/10/roses-law-for-quantum-computers.html)).  Quantum Annealing is much, much more dangerous to cryptography I would say.