Photon-photon interaction in cold gases

We realize the limit of quantum nonlinear optics, where photons interact strongly among themselves. Employing the dipolar interaction between cold Rydberg atoms, we make photons scatter, attract, or repel each other.

Light storage in atomic vapor

We study coherent optical excitations of atoms in a hot vapor. We develop new techniques for quantum memories that optimize bandwidth, storage time, and fidelity.

Atom interferometry

We look into new physical tools for initializing, reading out, and increasing the interrogation times of atom interferometers.