Design of an Ultra-Efficient Reversible Full Adder-Subtractor in Quantum-dot Cellular Automata

TL;DR

This paper presents a novel, ultra-efficient reversible full adder-subtractor circuit based on quantum-dot cellular automata, significantly reducing energy dissipation and improving manufacturability compared to existing designs.

Contribution

A new reversible QCA-based full adder-subtractor design that uses a single layer without rotated cells, enhancing manufacturability and reducing energy, area, and cell count.

Findings

Reduces energy dissipation by 48%

Decreases area and cell count significantly

Uses only one layer without rotated cells

Abstract

By the progressive scaling of the feature size and power consumption in VLSI chips the part of energy dissipated due to information loss in irreversible computations will become a serious limitation in the near future. Quantum-dot cellular automata (QCA) is an emerging nanotechnology with extremely low energy dissipation which facilitates new computation paradigms such as reversible computing. In this paper a novel reversible full adder-subtractor circuit based on QCA is proposed. Our proposed design is implemented using only one layer and does not require any rotated cells which significantly improves the manufacturability of the design. In addition, it improves the cell count, area and total energy dissipation by almost 45% and 50% and 48%, respectively, as compared to the existing QCA-based single-layer and multilayer reversible full adders.