A Cost-Efficient QCA XOR Function Based Arithmetic Logic Unit for Nanotechnology Applications

Abstract

Quantum-dot Cellular Automata (QCA) is an innovative nanometer technology that suggests less dimension, less power consumption, with extra speed, and reflected as an amplification to the scaling complications with CMOS computation methodology. Additionally, an Exclusive-OR (XOR) gate is a basic building block in various significant circuits like a Full Adder (FA), comparator, etc. In this work, we designed an optimized QCA XOR gate and its application in some logical gate designing. This paper shows the cell optimization and a realization of the QCA XOR gate, full adder, and full subtractor and further these layouts are used to design 1-bit QCA ALU. Full adders are the most critical component of any electronic device because all electronic devices need ALU and full adders are the primary architecture of an ALU. The optimized full adder has been chosen to build QCA ALU and parameters like number QCA cells, latency, area, and quantum cost have improved in the proposed design approach and the proposed adder represents the least area and latency among other reference circuits in nanotechnology. All the simulations are verified with the free accessible QCA Designer simulation environment.