, where the barrier-control parameters ϵ b k = (V bh k )/V 0k are related to the height of the targeted interdot barrier (V b , measured from the origin of the energy scale), and V 0k = m * ω 2 xk x 2 k /2. We note that measured from the bottom of the left (k = 1) or right (k = 2) well the interdot barrier is V b -h k .