Silicon carbide MOSFETs are transforming power electronics by enabling higher switching frequencies and lower losses than their silicon-only counterparts. This study uses time-gated optical spectroscopy to investigate defect-assisted recombination in fully processed devices, specifically addressing their well-known hysteresis. The inquiry identifies a local vibrational mode with a very energy of 220 meV, indicating the presence of a carbon-cluster-like defect. This approach to characterizing interface states in MOSFETs reveals possibilities for enhancing device reliability and performance.

Delving into the advancing realm of low-power, high-density magnetic memory, this research presents a Ta/(Pt/Ta)${}_4$/Pt/Co/Ta multilayered structure. Confronting challenges in conventional spin-orbit torque (SOT) magnetic random-access memory (MRAM), such as low spin Hall angles and elevated current densities, the authors achieve a reduction of 79% in critical-switching-current density, while enhancing torque efficiency and minimizing coercivity. Notably, a strong linear correlation among key parameters validates the domain-wall-depinning model, broadening its applicability to diverse metal dopants.

Quantum noise spectroscopy (QNS) is a powerful tool to characterize temporally correlated environmental noise, for noise-tailored control in noisy intermediate-scale quantum processors. However, QNS protocols have been limited by their vulnerability to state-preparation-and-measurement (SPAM) errors, and their inability to simultaneously characterize dephasing and relaxation effects. This work overcomes both of these challenges. The authors present a single-qubit QNS protocol utilizing continuous off-axis control for robust estimation of all multiaxis noise spectra, and show that SPAM errors can significantly alter or mask important features of the underlying native noise.

Arrays of single atoms trapped in optical tweezers have become a leading platform for quantum science and technology. A challenge at the frontier of the field is to scale up the number of atoms into the thousands. In addition, combining these arrays with a cryogenic environment would come with significant gains in lifetime and fidelity of quantum operations. This study successfully combines large-scale atomic arrays with a cryogenic environment, at a temperature of 6 K. The authors demonstrate the rearrangement of more than 800 atoms within a 2000-site array and discuss possible improvements of the setup, in a key step toward better, larger atom arrays for quantum technologies.

Harnessing spin waves for high-speed computing: In this work an innovative spin-wave reservoir chip, utilizing ferromagnetic permalloy thin films, demonstrates exceptional capabilities. By strategically manipulating spin-wave interference, the authors achieve a multi-input–multi-output reservoir capable of memory retention, nonlinearity enhancement, and accurate magnetic field estimation. This spintronic hardware paves the way for high-speed applications in reservoir computing and signal processing.

High-quality, distributed entanglement forms the foundation for the unequaled level of security that can be assured in quantum key distribution (QKD), but its susceptibility to noise hinders practical implementations. This study experimentally demonstrates that enhancing quantum resources with quantum privacy amplification (QPA) increases the noise resilience of QKD beyond classical limits. Leveraging hyperentanglement in different field-tested degrees of freedom of a photon pair increases the efficiency of QPA, thereby unlocking its advantage for QKD. Here is a method to generate secure keys under noisy conditions, which was previously impossible, paving the way for robust QKD.

Interlayer exchange coupling (IEC) has been incorporated into almost all magnetic thin-film devices in the form of synthetic antiferromagnets, yet how such coupling is affected by the mixing of magnetic atoms into the nonmagnetic spacer layer is often overlooked. The authors show that antiferromagnetic IEC can be achieved and enhanced by spacer layers containing over 60 at.% of magnetic atoms, leading to huge antiferromagnetic bilinear coupling strength in multilayers deposited by magnetron sputtering. The magnetic atoms in these spacers exhibit a large magnetic moment, highlighting not only the importance of free electrons but also the role of magnetic moments in governing IEC.

Laser-written optical waveguides in diamonds are a key technology to enhance coupling between defect centers and light, boosting applications in nanoscale sensing and quantum information processing. However, laser writing of photonic structures produces strain in the diamond lattice, modifying the properties of defect centers in poorly understood ways. This study demonstrates that optically detected magnetic resonance spectroscopy provides sufficient information to fully characterize the spatial distribution of strain in such a device, even without a constant magnetic field. The work yields an accessible tool that could be very useful for advancing diamond-based quantum technologies.