Matter near the absolute zero has fascinating properties. Ultracold atoms and molecules can be confined in tiny regions of space and studied with great precision. At ZLab, we use laser light to create ultracold diatomic molecules of strontium. These molecules form a unique system that allows us to measure subtle yet important properties of basic molecular physics. On a more fundamental level, they will provide an ensemble of tiny molecular clocks, where the molecule vibration determines the ticking rate. This type of quantum clock can help us test Einstein's equivalence principle in our universe and Newton's gravitational force at the nanometer scale.
By attaining control over many properties of light and matter, we can design systems that reach new capabilities, both in fundamental and applied sciences. In collaboration with the Laboratory for Astrophysics, we built an apparatus to quantify a tiny contamination of a noble-gas detector used in Dark Matter searches. Together with the Department of Mechanical Engineering, we use microcavities to stabilize lasers for next-generation portable atomic clocks.