QCA: An effective approach to implement logic circuit in nanoscale

Typical lithography based VLSI technology employed to elevate higher scale assimilation, low powered computing and better switching frequency of semiconductor constituents. Yet, the tendency encounters severe threats because of major physical bounds of Complementary Metal Oxide Semiconductor (CMOS) technology as tunneling concern, doping variations at nanoscopic scale and short channel issue. Quantum-dot cellular automata (QCA) is a promising nanotechnology which offers a unique approach to evade the transistor concept to design molecular scale computing components and presents a novel method of information shift. Reversible logic circuit is obtained to be low power architecture that turns into developing technology in low-power nanotech. In this work, an efficient layout of logic and arithmetic circuit using QCA is presented where the circuits are formed using least number of QCA cells as well as no crossover.