After the “first quantum revolution” – the development of devices such as lasers and the atomic clock – the “second quantum revolution” is currently in full swing. Experts from all over the world are developing fundamentally new technologies based on quantum physics. One key application is quantum communication, where information is written and sent in light. For many applications making use of quantum effects, the light has to be in a certain state – namely a single photon state. But what is the best way of generating such single photon states? In the PRX Quantum journal, researchers from Münster, Bayreuth and Berlin have now proposed an entirely new way of preparing quantum systems in order to develop components for quantum technology.