Modeling and Implementation of Reversible Logic Gates Using QCA
Merlin Thomas, Riboy Cheriyan · 2025
The main obstacles to the development of future computational circuits are shrinking transistor sizes and power dissipation. Moore's law cannot be applied to duplicate transistor density, at least not until the transistor size reaches the atomic scale. Physical limitations such as the quantum effect and the unpredictable way in which tiny currents act in this state, as well as the technological side of limitations faced in aspects such as complexity of designs and higher power consumption, might hinder the potential and future of microelectronic conventional circuit scaling. In light of this, future designs must be made capable of using alternative technologies, such as the Quantum Dot-Cellular Automata (QCA), which is a transistor-free method and shows promising results as a replacement for the current existing and widely used CMOS technology. It is an apt replacement because of its reduced size, increased speeds, immense scalability, better and improved switching frequency, and lower power consumption. In addition, when reversible logic is combined with QCA, a lot more power dissipation can be reduced, and also circuit scaling can be achieved. Today's irreversible circuits lead to the loss of information in the form of heat dissipation, limiting further advancements in circuit size reduction and complexity integration. Reversible logic technology, which does not erase information, eliminates this problem. In this paper, a general overview of QCA technology and reversible logic is described. This manuscript presents enhanced and effective configurations of various reversible logic gates utilizing QCA in accordance with optimal specifications. QCA Designer 2.0.3 has been employed for the simulation of reversible logic gates.