Progress toward large-area strontium atom interferometry for precision gravitational measurements

Atom interferometers in which atoms are delocalized over macroscopic distances can provide excellent sensitivity for gravitational measurements. I will describe progress on the design and construction of a two-meter-tall strontium atomic fountain that aims to leverage such atom interferometers to search for new interactions beyond the standard model via tests of the gravitational inverse square law and to make a new measurement of Newton’s gravitational constant. Moreover, I will discuss progress on MAGIS-100, a 100-meter-tall atom interferometer being built at Fermilab to serve as a prototype gravitational wave detector in the 0.3 – 3 Hz range and to search for ultralight dark matter.