Hm, there is no way we can control a being which is more intelligent than all of us to multiple powers of ten, and which thinks and learns faster than all of us.
To keep it under control the best would be to completely isolate that thing, but why make one in the first place if you will not use it for anything?
To keep it in a "bottle" and show it to friends during a BBQ Party?
In other posts i wrote that such a being doesnt have to be hostile toward us, but it doesnt need to be hostile (skynet level hostile) to take away power/freedom from us for our own best, and keep us "inside" so we wont do stupid things.
So the only way to make sure that we stay in control is to upgrade ourself to AI-Levels, or at least a few of us... which again doesnt sound that good since we allready know that we are capable and willing to crush, kill, and destroy and be it only for the sake of the entertainment value of those activities.