A bright and fast source of coherent single photons.

A single-photon source is an enabling technology in device-independent quantum communication, quantum simulation, and linear optics-based and measurement-based quantum computing. These applications employ many photons and place stringent requirements on the efficiency of single-photon creation. The scaling on efficiency is typically an exponential function of the number of photons.

A gated quantum dot strongly coupled to an optical microcavity.

The strong-coupling regime of cavity quantum electrodynamics (QED) represents the light-matter interaction at the fully quantum level. Adding a single photon shifts the resonance frequencies-a profound nonlinearity. Cavity QED is a test bed for quantum optics and the basis of photon-photon and atom-atom entangling gates.