Optimized Design of Reversible Gates in Quantum Dot-Cellular Automata: A Review

At low power Nanocomputing world, reversible logic computing in Quantum Dot-Cellular Automata (QCA) is a rising area of research. Very high device density, ultra low power consumption and faster switching speed of QCA promises cost effective energy efficient logic design with high complexity at nano scale. Reversible logic synthesis has prevalent applications in QCA. Researchers have investigated lots of work on the design of reversible logic circuits in QCA but still the design of different basic reversible gates in QCA remains unexplored. This paper depicts the design of different reversible gates such as Fredkin gate, Peres gate, Toffoli gate, RUG gate, QCA1 and QCA2 gate CQCA gate, C-NOT gate etc. using QCA. For the first time the reversible Peres gate is achieved in QCA. This work is also layout the detailed comparative analysis of proposed circuits with prior design in terms of MVs, area and clocking speed and the comparison with respect to average number of gates required to design the standard thirteen functions by different reversible gate is prescribed. All the circuits are implemented and simulated using Bi-stable simulation tool QCA Designer-2.0.3.