QCA Majority Gate — Three-Input Clocked Voting Cell (2D)

Quantum-dot cellular automata compute with electrostatic polarization instead of current, and their universal logic primitive is the majority gate: three input wires converge in the plane on a single cell whose electron pair feels the combined Coulomb field of all three neighbors at once. This 2D top-down simulator renders exactly that convergence — something a straight 3D wire view cannot show — with the same four-phase adiabatic clock (Switch → Hold → Release → Relax, offset 90° per zone) driving every cell along the three input arms, the gate, and a five-cell output wire. Flip any of the three driver bits and watch the gate cell relax toward the true sign of their sum a quarter clock cycle after its neighbors latch, then watch that majority result cascade down the output wire one zone at a time.