In case the wave function is separable, that is, if ψ ψ factorizes in the form ψ ψ ( r 1 , r 2 , t ) = ψ ψ A ( r 1 , t ) ψ ψ B ( r 2 , t ) , the two one-particle systems behave independently. More generally, the quantum potential of an n -particle system with separable wave function is the sum of n quantum potentials, separating the system into n independent one-particle systems.