  The existence of a nonzero permanent electric dipole moment (EDM) of the
neutron would reveal a new source of CP violation and shed light on the origin
of the matter--antimatter asymmetry of the Universe. The sensitivity of current
experiments using stored ultracold neutrons (UCN) probes new physics beyond the
TeV scale. Using the UCN source at the Paul Scherrer Institut, the nEDM
collaboration has performed the most sensitive measurement of the neutron EDM
to date, still compatible with zero ($|d_n|<1.8\times 10^{-26} \, e {\rm cm}$,
C.L.90%). A new experiment designed to improve the sensitivity by an order of
magnitude, n2EDM, is currently in construction.
