Logical devices implemented using quantum cellular automata

TLDR

Quantum cells contain two electrons whose Coulomb interaction with neighbors aligns their charge along one of two perpendicular axes, enabling binary encoding. The study investigates implementing logic devices with coupled quantum dot cells, designing inverters, programmable logic gates, dedicated AND/OR gates, and non‑interfering wire crossings. Each cell’s state is highly nonlinear with respect to neighboring cells, and a line of such cells can transmit binary information. Simulations of complex arrays demonstrate implementation of an exclusive‑OR function and a single‑bit full adder.

Abstract

We examine the possible implementation of logic devices using coupled quantum dot cells. Each quantum cell contains two electrons which interact Coulombically with neighboring cells. The charge distribution in each cell tends to align along one of two perpendicular axes, which allows the encoding of binary information using the state of the cell. The state of each cell is affected in a very nonlinear way by the states of its neighbors. A line of these cells can be used to transmit binary information. We use these cells to design inverters, programmable logic gates, dedicated AND and OR gates, and non-interfering wire crossings. Complex arrays are simulated which implement the exclusive-OR function and a single-bit full adder.