Not if we're really living in a simulation: e.g. if you initiate the state change of an atom ( the example was the addition of one quanta of energy ), then even

Not if we're really living in a simulation: e.g. if you initiate the state change of an atom ( the example was the addition of one quanta of energy ), then eventually the state will change from quanta 0 to quanta 1, with possibly many superpositions of both states during the described finite lifetime of the transition. This, to me, sounds so much like eventual consistency ( for observers ), that it's a bit scary.