Detecting particle-like interactions via coherently enhanced decoherence

Elusive particles, such as sub-GeV dark matter candidates or even the well-known neutrinos that decoupled one second after the Big Bang, may have evaded detection due to the tiny energy they deposit in detectors. Even when detected, experiments with energy thresholds are only sensitive to the high-q^2 region of the scattering rate, which is not the dominant contribution for many scenarios, such as dark-matter interactions mediated by long-range forces or low-momentum transfers that are Born-enhanced. In this talk, I will discuss the potential of atom interferometers to probe such particle-like interactions through an open-quantum-system framework and how this approach applies to dark matter searches.