  We report the detection of pulsed gamma rays from the Crab pulsar at energies
above 100 Gigaelectronvolts (GeV) with the VERITAS array of atmospheric
Cherenkov telescopes. The detection cannot be explained on the basis of current
pulsar models. The photon spectrum of pulsed emission between 100
Megaelectronvolts (MeV) and 400 GeV is described by a broken power law that is
statistically preferred over a power law with an exponential cutoff. It is
unlikely that the observation can be explained by invoking curvature radiation
as the origin of the observed gamma rays above 100 GeV. Our findings require
that these gamma rays be produced more than 10 stellar radii from the neutron
star.
