  Permanent electric dipole moments (EDMs) of fundamental particles such as the
electron are signatures of parity and time-reversal violation due to physics
beyond the standard model. EDM measurements probe new physics at energy scales
well beyond the reach of present-day colliders. Recent advances in assembling
molecules from ultracold atoms have opened up new opportunities for improving
the reach of EDM experiments. But better measurement techniques, that are not
limited by the magnetic field sensitivity of such molecules, are necessary
before these opportunities can be fully exploited. We present a technique that
takes advantage of magnetically-insensitive hyperfine clock transitions in
polar molecules, and offers new ways to improve both the precision and accuracy
of EDM searches with ultracold assembled molecules.
