An efficient Quantum-Dot Cellular Automata adder

This paper presents a ripple-carry adder module that can serve as a basic component for Quantum Dot Automata arithmetic circuits. The main methodological design innovation over existing state of the art solutions was the adoption of so called minority gates in addition to the more traditional majority voters. Exploiting this widened basic block set, we obtained a more compact, and thus less expensive circuit. Moreover, the layout was designed in order to comply with the rules for robustness again noise paths [6].