A Novel Design of Reversible Gate using Quantum-Dot Cellular Automata (QCA)

Quantum computing is one of the emerging technologies which is an alternative for Complementary Metal Oxide Semiconductor (CMOS) based design approaches such as VLSI and ULSI. The advantage of this new domain includes substantially faster processing speed and requirement of very less area for circuit integration as compared to CMOS technology. Quantum-dot Cellular Automata (QCA) is the backbone of quantum computing for integrated circuit designing with the execution of conventional logical operations. Implementation of the reversible gate using QCA is one of the fundamental requirements to design complex logic circuits because such a reversible gate is advantageous not only in terms of power consumption and energy dissipation but also in terms of functional area requirements for the physical integration of digital circuits. There are multiple applications of reversible logic circuits in various fields such as low power CMOS, Nanotechnology, DNA computing, quantum computing, etc. This paper provides modified and efficient designs of several reversible logic gates using QCA in optimum requirements.