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Quantum-dot cellular automata (QCA) is a novel nanotechnology that promises smaller size, lower power consumption, with faster speed and is considered as a solution to the scaling problems in complementary metal oxide semiconductor technology. We propose a novel QCA F-shaped XOR gate. The proposed gate is simple in structure and powerful in terms of implementing digital circuits. We implement novel adder circuits like half adders and half subtractors by introducing the proposed XOR gate. The proposed adder circuits are simple in design and occupy a fraction of area, as compared to previous designs. These circuits are suitable for optimizing the complex structures. Simulation results demonstrate that the new structures have achieved significant improvements in terms of circuit complexity. The functionality of proposed structures have been checked by QCADesigner tool.

A new F-shaped XOR gate and its implementations as novel adder circuits based Quantum-dot cellular Automata (QCA)