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Tunneling two level systems (TLS), present in dielectrics at lowtemperatures, have been recently studied for fundamental understanding andsuperconducting device development. According to a recent theory by Burin\textit{et al.}, the TLS bath of any amorphous dielectric experiences adistribution of Landau-Zener transitions if exposed to simultaneous fields. Inthis experiment we measure amorphous insulating films at millikelvintemperatures with a microwave field and a swept electric field bias using asuperconducting resonator. We find that the maximum dielectric loss permicrowave photon with the simultaneous fields is approximately the same as thatin the equilibrium state, in agreement with the generic material theory. Inaddition, we find that the loss depends on the fields in a way which allows forthe separate extraction of the TLS bath dipole moment and density of states.This method allows for the study of the TLS dipole moment in a diverse set ofdisordered films, and provides a technique for continuously inverting theirpopulation.

Landau-Zener population control and dipole measurement of a two level system bath