Topological quantum error-correcting code on a 2D lattice. Vertex (e-type) and plaquette (m-type) anyons
are created by flipping qubits. Braiding e around m accumulates a −1 phase — topological protection in action.
Click qubits (edges) to flip them and create anyon pairs. Vertex anyons (e) shown in red, plaquette anyons (m) in blue.