In a breakthrough, researchers have made major strides in developing diamond spin-photon quantum computers, which promise to outperform other quantum computing approaches. The SPINNING consortium, led by Fraunhofer Institute for Applied Solid State Physics IAF and coordinated by Prof. Dr. Rüdiger Quay, has successfully demonstrated entangled qubit registers at high fidelity over a distance of 20 meters. This achievement marks a significant milestone in the development of quantum computers that can solve complex problems exponentially faster than modern supercomputers.
The spin-photon-based quantum computer uses color centers in diamond to create qubits, which are then optically coupled over long distances. The consortium has also made significant improvements in central hardware and software, as well as peripherals for the quantum computer. Companies involved in the project include Diamond Materials GmbH, NVision Imaging Technologies GmbH, Qinu GmbH, Quantum Brilliance GmbH, and Swabian Instruments GmbH. With its lower cooling requirements, longer operating times, and lower error rates, this technology has the potential to revolutionize computing as we know it.
Diamond Spin-Photon Quantum Computers: A Promising Approach to Overcome Current Limitations
The development of quantum computers has been a subject of intense research in recent years. Among the various approaches being explored, diamond spin-photon-based quantum computers have shown significant promise in overcoming some of the current limitations of other technologies.
One of the major advantages of diamond spin-photon-based quantum computers is their lower cooling requirements compared to other approaches. This is because they do not require the extremely low temperatures needed for superconducting qubits, making them more feasible for practical applications. Additionally, these systems have demonstrated longer operating times, which is essential for performing complex calculations and maintaining the fragile quantum states.
The SPINNING project, a collaborative effort funded by the Federal Ministry of Education and Research (BMBF), has achieved remarkable successes in demonstrating the entanglement of two registers of six qubits each over a distance of 20 meters. This was accomplished with a high mean fidelity, indicating a strong correlation between the entangled states. This achievement is significant, as it paves the way for the development of more complex quantum systems.
When compared to SJJ-based quantum computers, which have received significantly more investment worldwide, the spin-photon-based approach has demonstrated comparable error rates and coherence times. Specifically, the spin-photon-based system with 12 qubits has achieved an error rate of <0.5%, similar to prominent SJJ models like Eagle (127 qubits) and Heron (154 qubits). Furthermore, the spin-photon-based system has a longer coherence time of over 10 milliseconds, outperforming the SJJ models.
Despite these successes, there are still technical challenges that need to be addressed before the end of the project. One of the primary challenges is the further development of resonator design towards improved reproducibility and more precise alignment. Additionally, researchers are working on enhancing the software for automatic control of the spin-photon-based quantum computer’s routing.
The SPINNING project is a collaborative effort involving six universities, two non-profit research institutions, five industrial companies (SMEs and spin-offs), and 14 associated partners. It is funded by the Federal Ministry of Education and Research BMBF within the framework program of the Federal Government Quantum Technologies — from Fundamentals to Market. The Fraunhofer Institute for Applied Solid State Physics IAF leads the consortium.
In conclusion, diamond spin-photon-based quantum computers have shown significant promise in overcoming some of the current limitations of other technologies. With further development and refinement, this approach may lead to more practical and scalable quantum computing systems.
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