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Category: quantum physics – Page 53

When it comes to layered quantum materials, current understanding only scratches the surface; so demonstrates a new study from the Paul Scherrer Institute PSI. Using advanced X-ray spectroscopy at the Swiss Light Source SLS, researchers uncovered magnetic phenomena driven by unexpected interactions between the layers of a kagome ferromagnet made from iron and tin. This discovery challenges assumptions about layered alloys of common metals, providing a starting point for developing new magnetoelectric devices and rare-earth-free motors.

The research is published in the journal Nature Communications.

Patterns are everything. With , it’s not just what they’re made of but how their atoms or molecules are organized that gives rise to the exotic properties that excite researchers with their promise for future technologies.

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Many objects that we normally deal with in quantum physics are only visible with special microscopes—individual molecules or atoms, for example. However, the quantum objects that Elena Redchenko works with at the Institute for Atomic and Subatomic Physics at TU Wien can even be seen with the naked eye (with a little effort): They are hundreds of micrometers in size. Still tiny by human standards but gigantic in terms of quantum physics.

Those huge quantum objects are —structures in which electric current flows at low temperatures without any resistance. In contrast to atoms, which have fixed properties, determined by nature, these artificial structures are extremely customizable and allow scientists to study different physical phenomena in a controlled manner. They can be seen as “artificial atoms,” whose physical properties can be adjusted at will.

By coupling them, a system was created that can be used to store and retrieve light—an important prerequisite for further quantum experiments. This experiment was carried out in the group of Johannes Fink at ISTA, with theoretical collaboration from Stefan Rotter at the Institute for Theoretical Physics at TU Wien. The results have now been published in the journal Physical Review Letters.

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Researchers at the University of Twente have solved a long-standing problem: trapping optically-generated sound waves in a standard silicon photonic chip. This discovery, published as a featured article in APL Photonics, opens new possibilities for radio technology, quantum communication, and optical computing.

Light travels extremely fast, while sound waves move much more slowly. By manipulating the interaction between light and sound—a physical phenomenon known as stimulated Brillouin scattering (SBS)—researchers can find new ways to store and filter information in a compact chip.

This is useful in applications such as ultra-fast radio communication and quantum technology. But doing this in silicon photonic chips, one of the most important integrated photonics technologies today, was a major challenge.

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“ tabindex=”0” quantum computing and secure communications. Scientists have optimized materials and processes, making these detectors more efficient than ever.

Revolutionizing Electronics with Photon Detection

Light detection plays a crucial role in modern technology, from high-speed communication to quantum computing and sensing. At the heart of these systems are photon detectors, which identify and measure individual light particles (photons). One highly effective type is the superconducting nanowire single-photon detector (SNSPD). These detectors use ultra-thin superconducting wires that instantly switch from a superconducting state to a resistive state when struck by a photon, enabling extremely fast detection.

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By combining digital and analog quantum simulation into a new hybrid approach, scientists have already started to make fresh scientific discoveries using quantum computers.

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Researchers from the National University of Singapore (NUS) and University of New South Wales (UNSW) Sydney have proven that a spinning atomic nucleus really is fundamentally a quantum resource. The teams were led respectively by Professor Valerio Scarani, from NUS Department of Physics, and Scientia Professor Andrea Morello from UNSW Engineering. The paper was published in the journal Newton on 14 February 2025.

It has long been inferred that tiny particles such as electrons or protons are indeed quantum due to the way they get deflected in a magnetic field. However, when left to spin freely, they appear to behave in exactly the same way as a classical spinning item, such as a Wheel of Fortune turning on its axis. For more than half a century, experts in spin resonance have taken this fact as a universal truth.

For the same reason, a technician or a doctor operating a (MRI) machine at the hospital never needed to understand quantum mechanics—the spinning of the protons inside the patient’s body produces the same kind of magnetic field that would be created by attaching a fridge magnet to a spinning wheel.

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Researchers in Germany have developed a special technique that will allow better control over atomic reflections in quantum sensors. This new approach uses carefully engineered light pulses as atomic mirrors to cut noise and sharpen quantum measurements.

There’s a big difference between regular and quantum sensors. The former relies on classical physics to measure properties like temperature, pressure, or motion. However, their measurements are affected by factors like thermal noise, material quality, and environmental disturbances.

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