Novel Quantum-Dot Cellular Automata-Based Gate Designs for Efficient Reversible Computing

Reversible logic enables ultra-low power circuit design and quantum computation. Quantum-dot Cellular Automata (QCA) is the most promising technology considered to implement reversible circuits, mainly due correspondence between features of QCA circuits. This work aims push forward state-of-the-art QCA-based circuits implementation by proposing a novel full adder\full subtractor (FA\FS). At first, we consider an efficient XOR-gate, based on this, new layouts Feynman, Toffoli, Peres, PQR, TR, RUG, URG, RQCA, RQG are proposed. The XOR gate significantly reduces required clock phases area. As result, all proposed regarding cell count, delay, Finally, presented gates, (FA\FS) Compared FA\FS achieved up 57% area savings, with 46% 29% reduction in number respectively.