Physics for Scientists and Engineers

Quantum sensors, founded upon the wave nature of atoms, employ quantum interference to facilitate extremely precise measurements of accelerations and rotations. This technology demands the implementation of optimized beam splitters and mirrors for atomic applications. However, atoms that are reflected in unintended manners can significantly degrade measurement precision.

Researchers have made a significant breakthrough in controlling spin waves in magnetic materials. By creating a unique topological magnetic structure in permalloy films, they were able to generate, propagate, and observe spin waves, a crucial step towards future technologies.

Neutrons have a magnetic dipole moment, rendering them sensitive to magnetic fields generated by unpaired electrons in materials. This renders neutron scattering techniques a potent tool for probing the magnetic behavior of materials at an atomic level.

Within our Universe, it may be normal matter that we can directly detect, measure, manipulate, experiment with, and observe, but it's the dark matter that comprises most of the Universe's mass. While all the And yet, dark matter is only ever found in diffuse halos, never in collapsed clumps like normal matter. Why is that? That’s the subject of this week’s question, coming all the way scientists want to know: “How does dark matter, while being gravitational, not collapse? that addresses this apparent need for it to experience some sort of mutual repulsive force.”

Google-led researchers developed a hybrid digital-analog approach to simulate the natural progression of quantum systems toward thermal equilibrium, utilizing a quantum processor with 69 superconducting qubits. The study, published in Nature, highlights the versatility of their hybrid analog-digital quantum simulator in probing thermalization dynamics, surpassing the capabilities of classical computers and purely analog quantum devices.

Photosynthetic organisms, such as green plants, utilize quantum mechanical processes to harness solar energy, as Prof. Jürgen Hauer explains: "When light is absorbed by a leaf, electronic excitation energy is distributed across multiple states of each excited chlorophyll molecule, creating a superposition of excited states." This process enables efficient energy transfer and charge separation. Quantum mechanics plays a crucial role in understanding these initial steps, which occur continuously in green plants and other photosynthetic organisms, including photosynthetic bacteria. However, the precise mechanisms remain unclear. Hauer and first author Erika Keil view their study as a vital foundation for elucidating chlorophyll's function. Applying these findings to artificial photosynthesis units could facilitate unprecedented efficiency in solar energy utilization for electricity generation or photochemistry. The researchers examined two specific spectral regions where chlorophyll absorbs light: the low-energy Q region and the high-energy B region. The Q region comprises two electronically coupled states, enabling loss-free energy transport within the molecule. Subsequent relaxation occurs through "cooling," releasing energy as heat. The study demonstrates that quantum mechanical effects significantly influence biologically relevant processes.