  A vortex in a model spinless px+ipy superconductor induces two Majorana
fermions (MFs), one in the core and the other at the sample edge. In the
present work, we show that edge MF can be generated, fused, transported, and
braided easily by tuning gate voltages at point-like constriction junctions.
Solving the time-dependent Bogoliubov-de Gennes equation, we demonstrate that
the braiding of edge MFs obeys the non-Abelian statistics. The present setup is
therefore a promising implementation for topological quantum computation, and
has the advantage of easy manipulation and simple device structure.
