Quantum-Dot Cellular Automata Circuits for Post-Cmos Logic Implementation

Abstract

ABSTRACT: Quantum-dot cellular automata (QCA) offer a promising post-CMOS alternative due to their ultra-low-power operation and nanometer-scale switching cells. This work presents optimized QCA layouts for arithmetic and memory circuits, including a fault-tolerant ripple-carry adder and a robust majority gate-based register. The proposed designs reduce cell count, propagation delay, and susceptibility to thermal failures. A detailed simulation evaluates device-level tunneling behavior, layout constraints, and noise margins. Benchmarks indicate up to 70% energy reduction compared to equivalent CMOS designs. These insights highlight QCA’s potential for lowpower nanoelectronic systems where conventional scaling is limited.

KEYWORDS: QCA, Post-CMOS, Nanoelectronics, Majority gate, Low power logic