Digital logic gate using quantum-dot cellular automata

A functioning logic gate based on quantum-dot cellular automata is presente d, where digital data are encoded in the positions of only two electrons. T he 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 opera ted by applying inputs to the gates of the cell. The Logic AND and OR opera tions are verified using the electrometer outputs. Theoretical simulations of the Logic gate output characteristics are in excellent agreement with ex periment.