Complex logic functions based on cascading quantum wires (QWs) defined in a GaAs/AlGaAs-based twodimensional electron gas by electron-beam lithography and wet
chemical etching are demonstrated. The concept of connected QWs leads to a nanoelectronic full adder with independent carryand sum-bit structures. Monolithic designs were fabricated and were found to also demonstrate simultaneous switching with common
thresholds between high and low logic levels.