This paper presents the novel design of half adder and full adder using reduced number of QCA gates.This design utilizes the unique characteristics of QCA to design a half and a full adder.The basic component of QCA is a cell consisting of two electrons and four logically interacting quantum dots.Simulation indicates a fast,efficient and very attractive performance(i.e.complexity,area and delay)

Quantum dot cellular automata(QCA) shows promise as a post silicon CMOS,low power computational technology.Nevertheless,to generalize QCA for next generation digital devices,the ability to implement conventional programmable circuits based on NOR,AND and OR gates is necessary.We devise a new QCA structure,the QCA multiplier,employing the five quantum dot QCA cell.The structure can multiply two 4 bit binary number.Tihis work is motivated by the fact that implementing combinational multiplier using QCA will reduce its area and consequently its heat dissipation.The efficacy of our framework is that it uses QCA majority gates as its primitives.