A Novel Design and Implementation of Full Adder Circuit Using QCA and Qiskit

Traditional transistor-based CMOS technology confronts considerable hurdles when device dimensions shrink due to physical restrictions such as ultra-thin gate oxides, short channel effects, leakage currents, and high power dissipation at nanoscale regimes. One of the newest emerging nanotechnologies is quantum-dot cellular automata (QCA), which is based on Coulomb repulsion. It provides a novel computational platform for creating digital logic circuits employing quantum dots trapped in the potential well to effectively process and transfer information at the nanoscale, as a competitor to regular CMOS-based technology. In this paper, a full adder circuit is designed using CNOT and Toffoli quantum gates. The simulation results are obtained using the quantum-dot cellular automata designer tool and the IBM Qiskit simulator.