Synchrotron radiation sources: toolboxes for quantum technologies
A special look at the BESSY II experimental hall. © Volker Mai/HZB
The new edition of the Hitchhiker's Guide to synchrotron and FEL light sources for quantum technology has just been published, in print and online. © Anna Makarova/HZB
Synchrotron radiation sources generate highly brilliant light pulses, ranging from infrared to hard X-rays, which can be used to gain deep insights into complex materials. An international team has now published an overview on synchrotron methods for the further development of quantum materials and technologies in the journal Advanced Functional Materials: Using concrete examples, they show how these unique tools can help to unlock the potential of quantum technologies such as quantum computing, overcome production barriers and pave the way for future breakthroughs.
In quantum technologies, quantum physical principles such as superposition, interference and entanglement play a decisive role in their function. Components in quantum technology can perform calculations orders of magnitude more efficiently and encrypt information (quantum computing) or deliver unprecedented measurement accuracy in sensors. However, developing such components for practical use remains challenging because quantum systems are inherently sensitive to environmental disturbances, making precise control under normal conditions difficult. To make progress in this area and identify sources of error, it is essential that the materials and devices are thoroughly characterised and better understood.
Synchrotron and FEL radiation sources provide an ideal toolkit for this purpose. The available methods include non-destructive imaging, X-ray diffraction, spectroscopy, spectromicroscopy and investigations of electronic and magnetic nanostructures.
A team from HZB has written this overview together with colleagues from universities and other European synchrotron radiation sources.
Note:
The "Hitchhiker's Guide" to synchrotron and FEL light sources for quantum technology has been now printed and is available online ( www.helmholtz-berlin.de/srforqt ).
This brochure briefly introduces key methods and applications while offering a detailed directory of European experimental stations particularly suited for research in quantum technologies along with access modes and contacts.
"Hitchhiker's Guide" to synchrotron and FEL light sources for quantum technology
Anna Makarova, Oliver Rader, Kristiaan Temst, Jean Daillant (eds.)
- Spintronics at BESSY II: Real-time analysis of magnetic bilayer systemsSpintronic devices enable data processing with significantly lower energy consumption. They are based on the interaction between ferromagnetic and antiferromagnetic layers. Now, a team from Freie Universität Berlin, HZB and Uppsala University has succeeded in tracking, for each layer separately, how the magnetic order changes after a short laser pulse has excited the system. They were also able to identify the main cause of the loss of antiferromagnetic order in the oxide layer: the excitation is transported from the hot electrons in the ferromagnetic metal to the spins in the antiferromagnet.
- Electrocatalysts: New model for charge separation at the solid-liquid interfaceHydrogen is at the heart of the transition to carbon neutrality, as both an energy carrier and a reagent for green chemistry. However, large-scale production of hydrogen via electrolysis, as well as the production of many other chemical products, requires significantly cheaper and more efficient catalysts. A precise understanding of the electrochemical processes that take place at the interface between the solid catalyst and the liquid medium is highly useful for developing better electrocatalysts. In the journal Nature Communications, an European team has now presented a powerful model that determines charge separation at the interface, the formation of the electric double layer and local electric potential variations, and the resulting influence on the catalytic activity.
- Environmental Chemistry at BESSY II: Radicals in waterwaysHow do radicals form in aqueous solutions when exposed to UV light? This question is important for health research and environmental protection, for example with regard to the overfertilisation of water bodies by intensive agriculture. A team at BESSY II has now developed a new method of investigating hydroxyl radicals in solution. By using a clever trick, the scientists gained surprising insights into the reaction pathway.