Ivette Fuentes' group uses quantum information and metrology to probe fundamental physics at the interface of quantum theory and general relativity. Research: (1) quantum sensing of gravitational waves using relativistic quantum systems; (2) quantum clock synchronization and gravitational decoherence; (3) dark energy detection using quantum sensors; (4) quantum reference frames in curved spacetime. Bridges quantum sensing with gravitational physics.

Hogan proposed that the holographic principle implies a fundamental, universal quantum uncertainty ('holographic noise') in the transverse position of spacetime at the Planck scale, and co-led the Fermilab Holometer -- twin co-located, power-recycled Michelson interferometers -- to search for it, ruling out the simplest models to high significance. This is a distinct fundamental-light-physics/quantum-sensing approach from squeezed-light-enhanced GW interferometers (e.g., LIGO), using precision laser interferometry to probe quantum properties of spacetime itself rather than squeezing quantum noise in a detector.

Oppenheim developed a 'postquantum theory of classical gravity' in which spacetime remains fundamentally classical while quantum theory itself is modified, predicting stochastic fluctuations in spacetime that would manifest as an unpredictable, diffusive fluctuation in the measured weight of a precisely-monitored mass. He has proposed and is pursuing precision-mass experiments to test this prediction against the alternative (Bose-Marletto-Vedral-style) entanglement-witness route to probing the quantum nature of gravity, offering a theoretically distinct but experimentally complementary approach within UCL's quantum-gravity-sensing programme.