The Fraunhofer Institute is leading the way in developing a revolutionary quantum computer using diamond-based spin photons through the SPINNING project. This cutting-edge technology aims to reduce cooling requirements, extend operating times, and minimize error rates compared to traditional quantum systems. By harnessing the unique properties of diamonds, the project is creating stable qubits with a focus on scalability and fidelity in quantum computing. Recent milestones include showcasing qubit entanglement over long distances, surpassing conventional quantum computers in error rates and coherence time.
Quantum computers offer the potential to solve complex problems in a fraction of the time it would take traditional supercomputers. However, the journey to achieving this capability is complex due to various competing approaches in quantum system development. Each approach has its own advantages and limitations in areas such as hardware reliability, energy efficiency, and compatibility with existing technology.
The SPINNING project, coordinated by the Fraunhofer Institute for Applied Solid State Physics IAF, brings together a consortium of 28 partners to advance quantum computing through a diamond-based spin-photon model. This model is expected to require less cooling, operate for longer periods, and demonstrate lower error rates compared to other quantum computing technologies. Its hybrid design enhances scalability and connectivity for seamless integration with conventional computing systems.
Prof. Dr. Rüdiger Quay, the coordinator of the SPINNING network and institute director at Fraunhofer IAF, explains the process of creating qubits using color centers in the diamond lattice. These qubits are formed by trapping an electron in artificially created lattice defects doped with nitrogen, silicon, germanium, or tin. The electron spin interacts with neighboring nuclear spins, allowing for addressable qubits. The SPINNING quantum computer will feature multiple qubit registers optically coupled over long distances for efficient information exchange.
During the mid-term meeting of the Quantum Computer Demonstration Setups funding measure by the Federal Ministry of Education and Research, the SPINNING consortium presented significant project results. They successfully demonstrated the entanglement of multiple qubit registers over a distance of 20 meters with high fidelity. Improvements were made to the hardware, software, and peripherals of the spin-photon-based quantum computer, showcasing advancements in qubit generation, photonic resonator technology, and error mitigation.
Comparisons with superconducting Josephson junction-based quantum computers highlight the remarkable achievements of the SPINNING project. Despite fewer resources invested, the spin-photon-based quantum computer outperforms prominent SJJ models in error rates and coherence time. Remaining technical challenges include enhancing resonator design reproducibility, precise alignment, and software for automated control of the quantum computer’s routing.
The SPINNING project is at the forefront of quantum computing innovation, leveraging the power of diamonds to revolutionize quantum systems. With continued advancements and collaboration among partners, the project aims to overcome existing challenges and pave the way for a new era of computing technology.
