Dr. Benjamin Brecht and Prof. Jan Sperling were invited speakers at the Quantum Information Spring School "Photonic Quantum Technologies" in Les Houches, France. While Jan Sperling introduced the concepts underlying multimode quantum correlations, Benjamin Brecht gave an introduction to the nitty gritty details of parametric down-conversion in the optics lab. Both presentations were well received and sparked numerous inspiring discussions with talented young researchers from across the world.