A question occurred to me concerning the Bose-Einstein condensate: When you have a quantum gas of bosons at a low temperature you obtain a Bose-Einstein condensate where some bosons are in the same state. When you consider the two bosons with the same state, they should behave like one boson, shouldn't they? Because when you have an interaction you shouldn't have any preferences to one of the bosons. So there shouldn't be a way to separate the two boson after they reached the same state? Or does the Heisenberg uncertainty principle apply here? If so, who is this done in computation? Thanks it advance!