Quantum resistance standards play a crucial role in various industries, such as industrial production and electronics. The precise measurement of electrical resistance is essential for the manufacture of high-tech sensors, microchips, and flight controls. Researchers at the University of Würzburg have developed a groundbreaking method that can enhance the performance of quantum resistance standards. This innovative approach is based on a phenomenon known as the Quantum Anomalous Hall effect.

The Quantum Anomalous Hall Effect

The Quantum Anomalous Hall effect (QAHE) is a quantum phenomenon that allows the quantum Hall effect to exist even in the absence of an external magnetic field. This unique characteristic simplifies the experiment and provides an advantage in determining physical quantities like the kilogram. The QAHE enables resistance measurements without the need for a magnetic field, making it ideal for precision applications.

One of the challenges faced in utilizing the QAHE for practical metrological use is the disruption of the effect at higher currents due to an electric field. To address this issue, the physicists at the University of Würzburg have developed a solution using a multi-terminal Corbino device. By neutralizing the electric field with two separate currents, the resistance remains quantized up to larger currents, making the resistance standard based on QAHE more robust.

In a feasibility study, the researchers demonstrated that the new measurement method achieves precision comparable to basic DC techniques. The next step is to test the method using more precise metrological tools in collaboration with the Physikalisch-Technische Bundesanstalt (PTB). This partnership aims to further refine the method and explore its potential applications beyond the QAHE.

The development of a method to improve quantum resistance standards based on the Quantum Anomalous Hall effect represents a significant advancement in metrology. By enhancing the accuracy of resistance measurements without the reliance on an external magnetic field, this innovative approach opens up new possibilities for precise metrological applications across various industries. The collaboration between researchers at the University of Würzburg and PTB highlights the potential for further advancements in quantum metrology.


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