A New Quantum-Based Building Block for Designing a Nano-Circuit with Lower Complexity

Abstract

Next-generation nano-scale computational systems are being hampered by two significant obstacles: shrinking transistor size and power dissipation. Moore's law does not hold when transistor size reaches the atomic level. So, it becomes necessary to investigate alternative technologies that surpass traditional Complementary Metal Oxide Semiconductor (CMOS) technology's physical constraints. Quantum Dot Cellular Automata (QCA), a transistor-free computational paradigm, is thought to be the best alternative to CMOS technology for designing nano-scale logic circuits. However, not many designs cut energy usage and offer straightforward access to inputs and outputs. Moreover, adders, the primary component in logic circuits and digital arithmetic, are crucial in the development of several efficient QCA designs. In this context, the 4-bit Ripple Carry Adder (RCA) is a straightforward type of adder that can help produce circuits with minimal necessary space and power consumption because of its exceptional qualities. The synthesis of high-level logic further demonstrates the design's effectiveness. The outcomes of QCADesigner demonstrated that the proposed circuits are less complicated and use less power than earlier designs compared to conventional design approaches.