Wire-Crossings Optimization Based on Majority-of-Five and XOR-of-Three Primitives in QCA.

The difficulty of manufacturing and noise sensitivity of quantum-dot cellular automata (QCA) make wire-crossings optimization increasingly important. Novel logic primitives such as majority-of-five (MAJ5) and XOR-of-three (XOR3) with efficient QCA realizations can alleviate the wire-crossings issue. In this paper, we aim at 13 standard three-input Boolean functions, the QCA layouts of which are designed by introducing MAJ5 (Method A) and its combinations with XOR3 (Method B). The proposed designs are verified by the QCADesigner tool. Experimental results show we can reduce the number of QCA cells and area. In terms of area, we can achieve 30.69% and 48.35% reduction by Method A and B, respectively, compared with the state-of-the-art approach. The proposed designs are further used as building blocks for large-scale circuit designs. In one implementation, the Peres reversible gate is implemented based on Method B to decrease the area by 33.3%. [ABSTRACT FROM AUTHOR]