Broadly speaking, our work centers on understanding and harnessing the power of quantum interactions to to enable new tests of fundamental physics and new technology. Our work towards these goals, is roughly divided into two distinct efforts. The first effort is working towards a nuclear clock architecture based on thorium-229 atoms, which promises to outperform current atomic clocks in both stability and robustness. In addition to its obvious applications for time-keeping, this experiment should allow an unprecedentedly accurate test of the variability of the fundamental constants. The second effort is working to develop a generally applicable means to produce ultracold molecular ions. If samples of ultracold molecular ions can be produced they should enable quantum control of ultracold chemistry, precision tests of fundamental physics, and a new platform for quantum computation and simulation.