Computing with restricted minima systems

We describe a version of QCA we call ´restricted minima quantum-dot arrays´ (RMQDA). This design methodology attempts to reduce timing and input energy requirements by using clocked QCA cells only at isolated locations where gain is necessary. Where passive QCA cells are used, asymmetric spacing eliminates the existence of local minima configurations and allows the ground state to be reached. Separation of clocked regions also provides tolerance to clock distribution delays.