Design and implementation of 4-bit arithmetic logic unit using Quantum Dot Cellular Automata

Quantum Dot Cellular Automata is one of the six emerging technologies which help us to overcome the limitations of CMOS technology. Design of 4-bit ALU for AND, OR, XOR, and ADD operations using QCA is discussed through this paper. This design of 4-bit ALU using QCA is simple in structure having significantly lesser elements as compared to CMOS design. It also gives better result in terms of speed, area and power. A QCADesigner tool is used for Simulation of different components of 4 bit ALU.