Merging spin and superconducting qubits in planar Ge

Superconducting and semiconductor spin qubits are two of the leading platforms in the race for the realization of a quantum processor. While superconducting qubits have been used for demonstrating that a quantum device can solve a problem that a classical computer would not be able to address in any realistic amount of time, they are rather large which could become an issue when millions of qubits will be needed. On the other hand, quantum processors based on spin qubits are not yet so advanced, but spin qubits are very small, they can sustain quantum properties for longer times and when made out of Silicon and Germanium they are compatible with Silicon technology. Here we aim to make use of the best of those two worlds by making superconducting qubits which will utilize the properties of a semiconductor, Germanium, namely their electric field tunability not present for a superconductor. The goal of this project is to create a unified technological platform which will allow the coupling of superconducting and semiconductor qubits.