Wednesday 26 November 2025
Scientists have made a significant breakthrough in developing a new method for detecting single spins in diamond, which could have major implications for quantum technologies.
The researchers used a technique called photoelectric detection to detect the spin of individual nitrogen-vacancy (NV) centers in diamond. NV centers are tiny imperfections in the crystal lattice that can be manipulated to store and retrieve information.
Traditional methods for detecting NV center spins involve using optical techniques, such as shining a laser on the diamond to excite the spin. However, these methods have limitations, including low photon collection efficiency and the need for bulky optics.
The new method, developed by researchers at the University of Melbourne, uses electrical detection instead. By applying an electric bias to a Schottky junction in the diamond, the team was able to trap charge carriers generated by the spin-dependent photoionization of NV centers. These trapped charges can then be detected using a simple electrical circuit.
The technique has several advantages over traditional optical methods. For one, it is more efficient, allowing for faster and more reliable detection of single spins. Additionally, it doesn’t require complex optics or high-powered lasers, making it easier to integrate into devices.
The researchers demonstrated the effectiveness of their method by using it to detect the spin of individual NV centers in a diamond sample. They were able to achieve a detection fidelity of over 90%, which is comparable to the best optical methods.
This breakthrough has significant implications for the development of quantum technologies, such as quantum computing and sensing. By allowing for more efficient and reliable detection of single spins, this method could enable the creation of smaller, more powerful quantum devices.
The technique also opens up new possibilities for the study of NV centers themselves. Researchers can now use electrical detection to probe the spin dynamics of individual NV centers in real-time, which could lead to a deeper understanding of their behavior and potential applications.
While there is still much work to be done before this method can be widely adopted, the potential benefits are significant. As researchers continue to develop and refine the technique, we may see the creation of more powerful and efficient quantum devices that could have a profound impact on our daily lives.
Cite this article: “Electrical Detection of Single Spins in Diamond Breakthrough for Quantum Technologies”, The Science Archive, 2025.
Diamond, Spin Detection, Nv Centers, Quantum Technology, Photoelectric Detection, Electrical Detection, Schottky Junction, Charge Carriers, Quantum Computing, Sensing
