The Sangouard group works actively on the development of quantum networks — networks where the nodes are made with atoms that are connected by means of single photons. These networks will enable secure communications over long distances — a kind of internet with a security based on the laws of quantum physics. The group collaborated with a team from ICFO to demonstrate a source of single photons from a cold atomic ensemble with a tunability of the photon duration across more than 3 orders of magnitude up to 10 microseconds. These photons can address many different devices including systems which have a sharp energy structure and opens up an avenue for the implementation of hybrid quantum networks where one takes the best of various systems for high rate long distance quantum communications. These results have been published in Nature Communications.