In the QSolid project, a quantum computer demonstrator with various generations of quantum processor units (QPUs) of different performance profiles (size, precision, application reference) will be realized. It is based, among other things, on the fabrication of high-quality, highly integrated superconducting circuits. Their spectrum ranges from the central elements of the actual QPU over coupling and readout elements to lossless control and integration components.
The Leibniz-IPHT contributes with its established manufacturing and characterization processes for superconducting quantum and interface circuits to the QSolid project. As a result, circuit concepts and functional principles can be evaluated at an early stage and the development of key components such as the QPU can be implemented more quickly. In addition, the research and realization of required readout amplifiers and adapted integration processes is one of the Leibniz IPHT tasks. In the course of the project, a further development of adapted production methods and an optimization of characterization processes will take place. In particular, new superconducting material systems, e.g. based on NbN, are being investigated for their use in the scaling of QPU and microwave amplifiers, and interface circuits based on superconducting digital electronics are being implemented in the Leibniz-IPHT sub-project. The manufacturing methods developed in the project will be offered as part of a foundry service from the end of the project.

The QSolid project is funded by the BMBF under number 13N16152 as part of the call for "Quantum computer demonstration structures" via the project sponsor VDI.