Abstract
Quantum Dot Cellular Automata (QCA) is one of the emerging trends in the field of nanotechnology which help to overcome the limitations of CMOS technology. QCA is simple in structure having significantly lesser elements as compared to CMOS design. It has the potential for attractive features such as faster speed, smaller size and low power consumption than transistor based technology. Quantum-dot cellular automata have a simple cell as the basic element. The cell is used as a building block to construct gates, wires, and memories. By taking the advantages of QCA are able to design interesting computational architectures. Unlike conventional computers in which information is transferred from one place to another by means of electrical current, QCA transfers information by propagating a polarization state. This paper proposes a detailed design and analysis of combinational circuits such as half adder, full adder and decoder for quantum-dot cellular automata.