An alternative geometry for quantum-dot cellular automata

Abstract

Previous research on quantum cellular automata devices has restricted the cells to a single plane. In this paper, a noncoplanar arrangement is considered. These noncoplanar devices are found to be capable of implementing the same logical functions as conventional quantum cellular automata cells, and they typically require 50% of the area required by the conventional devices. Devices simulated in this paper include wires, corners, majority logic devices, wire crossings, inverters, and exclusive-OR gates. The proposed cellular arrangement is actually biplanar, which simplifies fabrication significantly.