  An interaction of electromagnetic field with a nanostructure composed of two
quantum dots is studied theoretically. An effect of a resonant electron
transfer between the localized low-lying states of quantum dots is predicted. A
necessary condition for such an effect is the existence of an excited bound
state whose energy lies close to the top of the barrier separating the quantum
dots. This effect may be used to realize the reversible quantum logic gate NOT
if the superposition of electron states in different quantum dots is viewed as
the superposition of bits 0 and 1.
