Design of a 2-dot 1-electron QCA full adder using logically reversible half adders

Quantum-Dot Cellular Automata (QCA) is coming to the forefront in the nanotechnology domain as it overcomes the serious technical limitations of CMOS technology. Here, using two-dimensional two-dot one-electron QCA cells we have designed a logically reversible half adder. Such half adders in pair are used to design a full adder. We have computed the potential energies to substantiate and analyse the proposed design and discussed the issues related to energy and power dissipation.