QUIET (“Quantum Internet of Things”) is a joint project, funded by the German Federal Ministry of Education and Research (Bundesministerium für Bildung und Forschung – BMBF), with the goal of developing a hybrid quantum-conventional – i.e. based on both quantum technologies as well as classical communication technology – communication network.


The digitalization of societies is continuously progressing. An increasing number of devices has network interfaces that are used to exchange information with and coordinate among each other, optimally fulfilling user needs. This Internet of Things and the increased dissemination of our data pose higher demands on the security of our communication networks. To meet these demands requires new technologies. Current networked devices exchange data regularly, however, the encryption is using cryptographic protocols which are based on the finite performance of today’s computers. Because of this, there are limits to the achievable data rates and to the security of this data. The application of quantum states in a quantum communication network offers novel possibilities. In such an approach data can be encrypted utilizing quantum states of light, leveraging fundamental laws of nature. This will allow communication to be secure and fast also in the future.


The goal of the joint project QUIET (Quantum Internet of Things) is to develop a hybrid quantum-conventional communication network. In the interplay of distributed quantum states and conventional transmission (quantum) sensors will be interconnected. Doing this, all layers of the network, from the physical layer up to the networking protocol layer, will be considered. Leading research groups from the domains of quantum communication and networking technology collaborate with telecommunication firms in this project, as well as with the Innovation Hub for Quantum Communication.


This project will demonstrate the various application possibilities of distributed quantum states for secure communication and performance increases in the future Internet of Things. The hybrid network developed here will enable the integration of quantum technologies with existing telecommunication infrastructure. This is an important step towards the commercial realization of quantum communication technologies at the high-tech location Germany. After successful carrying out of the project, a demonstrator will show specific advantages of a quantum Internet of Things as compared to current system designs. The network architecture will be detailed and specified and will allow further identification of use cases, as well as push the standardization of such network approaches. By doing this, this project crucially contributes to the buildup of quantum communication infrastructure and strengthens the technological and digital sovereignty of Germany and Europe.