Therefore, the position-space wave function of | ψ ψ 3 ⟩ is ψ ψ 3 ( x , t ) = c 1 ψ ψ 1 ( x , t ) + c 2 ψ ψ 2 ( x , t ) = 1 a ( ψ ψ 2 ( x 0 , 0 ) ⋅ ⋅ ψ ψ 1 ( x , 0 ) − − ψ ψ 1 ( x 0 , 0 ) ⋅ ⋅ ψ ψ 2 ( x , 0 ) ) ⋅ ⋅ e − − i E g t / ℏ ℏ .