We show how a chiral Dirac fermion (a massless electron or hole) can be
converted into a pair of neutral chiral Majorana fermions (a particle
equal to its own antiparticle). These two types of fermions exist on the
metallic surface of a topological insulator, respectively, at a magnetic
domain wall and at a magnet-superconductor interface. Interferometry of
Majorana fermions is a key operation in topological quantum computation,
but the detection is problematic since these particles have no charge.
The Dirac-Majorana converter enables electrical detection of the
interferometric signal.
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