Diamond-based quantum hardware for scalable quantum processors

In April, the kick-off for the project “QC-4-BW - Development and benchmarking of a diamond-based spintronic quantum register for a scalable quantum processor” coordinated by the Fraunhofer Institute for Applied Solid State Physics IAF took place. It is one of the first collaborative projects started in the course of the Competence Center Quantum Computing Baden-Württemberg. The aim of the project is the development and benchmarking of a miniaturized and scalable quantum processor based on optically coupled quantum registers, where each quantum register is formed by 10 nuclear spin-based qubits and one electron spin.

The core of the project is the development of a diamond-based, spintronic quantum register for a scalable quantum processor. For this purpose, a 10-qubit quantum register is being developed, which is the only register realized so far that also has an integrated quantum memory. In addition, the technological approach pursued also has the advantage of not having to be cooled to extremely low temperatures, as is the case with superconducting qubit systems. This not only facilitates the ongoing operation of diamond-based qubit hardware, but also the construction of quantum computer architectures and their connection to necessary readout and control electronics.

To test the performance of the technologies being developed in the project, the infrastructure of the Competence Center Quantum Computing Baden-Württemberg will be used. The developed quantum registers, the qubit topologies as well as the one- and two-qubit quantum gates will be compared with the corresponding components of the IBM quantum computer “Quantum System One”, which has been set up in Ehningen since the beginning of the year and whose operation is coordinated by Fraunhofer IAF and Fraunhofer IAO.