Digital Logic Gate Using Quantum-Dot Cellular Automata

TLDR

The paper presents a functioning logic gate based on quantum‑dot cellular automata that encodes digital data in the positions of only two electrons. The gate comprises a ring of four quantum dots linked by tunnel junctions and two single‑dot electrometers, operated by applying inputs to the cell gates and verified via electrometer outputs for AND and OR operations. Theoretical simulations of the logic gate output characteristics agree excellently with experimental results.

Abstract

A functioning logic gate based on quantum-dot cellular automata is presented, where digital data are encoded in the positions of only two electrons. The logic gate consists of a cell, composed of four dots connected in a ring by tunnel junctions, and two single-dot electrometers. The device is operated by applying inputs to the gates of the cell. The logic AND and OR operations are verified using the electrometer outputs. Theoretical simulations of the logic gate output characteristics are in excellent agreement with experiment.