Atom Interferometry
Using matter waves to measure gravity, acceleration, and rotation with extraordinary sensitivity. The quantum sensor behind GPS-free inertial navigation.
Atom interferometry exploits the fact that atoms are waves. Split a cloud of laser-cooled atoms into two quantum paths, let them fly, recombine them, and read the interference fringes. Because atoms have mass, the fringes record gravity, acceleration, and rotation with extraordinary sensitivity, the same trick as a laser interferometer, but with matter waves thousands of times more responsive to inertial effects.
The killer application is navigation without GPS: an atom-interferometric inertial unit drifts orders of magnitude slower than conventional gyroscopes, which is why defense agencies fund the field. Add gravimetry for mapping aquifers, magma chambers, and underground structures.
This is Colorado's quietest strength. Infleqtion's compact cold-atom platforms and the NIST/JILA cooling pedigree behind them are exactly the supply chain atom interferometry needs to leave the lab.