>The common hypothesis of the brain in a jar doesn't come into contradiction with this idea, for all I know my brain could be plugged to a computer simulating reality,
For once this is making a hypothesis that is more complicated than it has to be. Consider that there still has to be a "real world" that contains the Jar or the computer that runs the simulation. If you want to invent this extra layer that is rather complicated, you need to have really good reason for it. Quantum mechanics being confusing isn't a good enough reason. The point of producing theory is to be able to consistently describe reality and make predictions, and you want it to be as simple as possible. Unless you find something akin to an interface that shows code that relates to our world, there is no reason to assume that we are sims.