Immo Söllner’s paper entitled Deterministic Single-Phonon Source Triggered by a Single Photon was published in Physical Review Letters. In the manuscript, a collaboration with Leonardo Midolo and Peter Lodahl from the Niels Bohr Institute, we propose an optomechanical crystal that allows for the simultaneous control of a quantum dot’s photonic and phononic environments. We go on to show how this platform enables the generation of single phonons at gigahertz frequencies triggered by single photons in the near infrared. Future work will focus on the experimental realization of these ideas, in collaboration with groups at the University of Bochum and at the Niels Bohr Institute.