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Decoherence is anathema to quantum systems, as it reduces their performance and stability. Shulman et al.show that real-time Hamiltonian parameter estimation can significantly increase the coherence time of a qubit by enabling continuous adjustment of its control parameters.

Experiments that directly probe the quantum geometric tensor in solids have not been reported. Now, the quantum metric and spin Berry curvature—dual components of the quantum geometric tensor—have been simultaneously measured in reciprocal space.

An atomic single electron transistor, which utilizes a single atomic defect in a van der Waals material as an ultrasensitive, high-resolution potential sensor, is used to image the electrostatic potential within a moiré unit cell.

So-called photonic-crystal-excitonic-lattice polaritons can be observed by coupling excitons and Bloch waves in a periodic arrangement of GaAs/AlGaAs quantum wells. The effect can be tuned by using an electric field. These hybrid states may allow slow-light-enhanced nonlinear effects and enable observation of macroscopic coherence phenomena in solid-state systems.

Spin–orbit coupling is implemented in an optical lattice clock using a narrow optical transition in fermionic 87Sr atoms, thus mitigating the heating problems of previous experiments with alkali atoms and offering new prospects for future investigations.

Isolated many-body quantum systems do not thermalize with an external environment but in most cases the internal dynamics leads to the emergence of an effective thermal equilibrium for local degrees of freedom. Here the authors study this behaviour with a realization of a long-range spin model.

Thermal imaging lenses are typically made from expensive materials such as germanium and silicon. Here, the authors synthesise a sulfur-based polymer with high mid-wave infrared and long-wave infrared transparencies, presenting a high-performing, low-cost alternative to traditional thermal imaging lens materials.

By exploiting an optical thermodynamic framework, researchers demonstrate universal routing of light. Specifically, light launched into any input port of a nonlinear array is universally channelled into a tightly localized ground state. The principles of optical thermodynamics demonstrated may enable new optical functionalities.

Magic state distillation is achieved with logical qubits on a neutral-atom quantum computer using a dynamically reconfigurable architecture for parallel quantum operations.

3D spin textures are promising for future data storage but remain hard to detect, especially in antiferromagnets. Here, the authors show that electronic signals in electron microscopy can reveal these hidden structures, opening new paths to study and use 3D magnetic textures.

Charge transport is usually limited by collisions between the carriers, impurities and/or phonons. Collisions involving three bodies are generally much rarer. A study now reveals, however, that such supercollisions can play an important role in the properties of graphene.

The optical trapping of ultracold atoms allows for the simulation and controlled exploration of phenomena normally found in condensed matter systems. Here, the authors demonstrate spin–orbit coupling between lattice band pseudospins in a Bose-Einstein condensate of ultracold atoms.

Machine learning has been applied to problems in condensed matter physics, but its performance in an experimental setting needs testing. Zhang et al. study the effects of adversarial perturbations on a neural-network-based topological phase classifier, applied to experimental data from an NV center in diamond.

The authors report resonant soft x-ray scattering and polarimetry measurements on epitaxial thin films of La3Ni2O7. They find a diagonal bicollinear double spin stripe order, with no evidence of charge modulation.

Magnetic skyrmions are thought to possess a tube-like structure in three dimensions, but this has not been directly observed in experiment. Here, Birch et al. report real-space imaging of skyrmion tubes in a lamella of FeGe.

Qudits, multiple-level quantum systems, enable more efficient scaling of physical resources in quantum computing than qubits, but they are more difficult to control. Svetitsky et al.now experimentally demonstrate a simplifying technique that converts a four-level qudit into a pair of qubits.

Many-body effects in an interacting spin-orbit coupled Fermi gas are studied with the help of clock spectroscopy. The results provide a simple view of how strong collective dynamics arise from local interactions in the presence of spin–orbit coupling.

The authors develop an on-chip molecular deposition method to generate large electric fields in bilayer transition metal dichalcogenides, enabling the hybridisation of intralayer and hitherto unobserved interlayer excitons.

Friedel oscillations are ripples in the electron density surrounding a charge impurity. Bouhassoune et al. now use first-principle calculations to show that Friedel oscillation surrounding an oxygen impurity in a ferromagnetic film can be engineered and amplified by choice of substrate and film thickness

Mobile impurities can be useful probes of quantum states. Here, the authors theoretically identify polarons formed on the edge of topological insulating states, termed chiral polarons, that can be used to probe topological matter.

Transmission X-ray microscopy allows for the imaging of magnetic domains in thin film materials. Here, the authors exploit the angular dependence of the magnetic contrast to extract out-of-plane canting angles of stripe domains and topological defects in NdCo₅films buried under a NiFe layer.

Control over the orientation of electronic spins forms the basis for spintronic devices in both classical and quantum systems. Here, the authors observe electrically-tunable dissipation-controlled spin precession in a carbon nanotube quantum dot bridging two non-collinearly magnetized electrodes.

Quantum error correction of Gottesman–Kitaev–Preskill code states is realized experimentally in a superconducting quantum device.

Noise and decoherence are serious problems for scalable quantum computing schemes. Using an all-optical approach, Bell et al.explore the use of four-qubit graph states for encoding quantum information, and show that they can reliably detect and correct errors against loss.

Though strong-field induced carrier excitation allows for exploring ultrafast electronic properties of a material, characterizing post-excitation dynamics is a challenge. Here, the authors report linear petahertz photoconductive sampling in a solid and use it to real-time probe conduction band electron motion.

Advancing single-atom quantum information processing necessitates a deep understanding of electron and nuclear spin dynamics. Here, using pump-probe spectroscopy, the authors detect the coherent dynamics of a nuclear and electron spin of a single hydrogenated Ti atom on MgO surface.

In the Bloch or Neel domain walls in ferromagnets, the magnetization rotates smoothly from up to down, preserving its magnitude. Here, Lee et al show that Co3Sn2S2 exhibits a phase transition within its domain walls to a state in which the magnetization passes through zero rather than rotating as the wall is traversed.

Quantum teleportation moves the quantum state of a system between physical locations without losing its coherence, an essential criterion for emerging quantum information applications. Now, electron-spin-state teleportation in covalent organic electron donor–acceptor–stable radical molecules is demonstrated using entangled electron spins produced by photo-induced electron transfer.

A fully integrated semiconductor microlaser that exploits spin–orbit coupling of light emits in a four-dimensional Hilbert space, with flexible control of up to six degrees of freedom.

Domain wall motion driven by ultra-short laser pulses has potential for storage of information in magnetoelectronic devices. Here the authors demonstrate the conversion of a circularly polarized femtosecond laser light into inertial displacement of a domain wall in a ferromagnetic semiconductor.

Symmetry breaking is key to numerous notable effects, for instance, the emergence of a Rashba interaction at interfaces between two materials. Here, Zhang, Ding, and coauthors succeed in breaking in-plane mirror symmetries via crystallographic engineering, and observe a giant non-linear Hall effect and current induced magnetization at room temperature.

Hole-spin qubits based on semiconductor quantum dots offer potential advantages over their electron-spin counterparts, such as fast qubit control and enhanced coherence times. Liles et al. report a hole-based singlet-triplet spin qubit in planar Si MOS device and develop a model to describe its dynamics.

Strong lasing effects similar to those in the optical regime can occur at 1.5–2.1 Å wavelengths during high-intensity XFEL-driven Kα₁ lasing of copper and manganese.

Systems of electron spins in nuclear-spin-rich hosts are gaining attention for quantum memory applications. Using spin ensemble studies, the authors propose transition metal ions in halide double perovskites as promising candidates, featuring long electron spin coherence and deterministic nuclear spin control.

This study presents a proposal for an all-optical method for manipulating chiral superconductors. Light pulses can switch the handedness of the chirality, potentially enabling controlled local writing of domain walls and associated Majorana modes.

Nano-contact-based spin wave generation may enable high-frequency magnonic devices but has been limited to long wavelengths and weak signal strengths. Here the authors demonstrate high-order short-wavelength propagating spin waves with increased transmission rates and propagation lengths in magnetic tunnel junction stacks.

Many studies of polariton condensates have been limited to low temperatures. Here the authors demonstrate ambient polariton condensation in lattices using organic traps that profit from the stability of organic excitons and the large Rabi splitting.

A quantum two-level system can be coherently excited by a phase-locked dichromatic electromagnetic field. This technique can make single-photon generation more efficient as the pump light does not overlap in frequency with the emitted single photons.

The zero net moment of antiferromagnets makes them insensitive to magnetic fields and enables ultrafast dynamics promising for novel spintronics. Here the authors achieved pulse current induced Néel vector switching in Mn₂Au(001) epitaxial thin films, which is associated with a large magnetoresistive effect allowing simple read-out.

An adaptive heterodyne technique with a Josephson parametric amplifier detector allows a high-precision single-shot canonical phase measurement on a one-photon wave packet, complementing near-ideal measurements of photon number or field amplitude.

Trapped ions are promising for electrometry but limited by their weak intrinsic spin coupling to electric fields. Now it is shown that using a magnetic field gradient enhances sensitivity and enables precise measurements across subhertz to kilohertz frequencies.

Knowledge of the density of optical states is crucial for understanding the function of photonic devices. A method that can map optical states with subwavelength precision, and therefore allow the study and design of optical properties on the nanoscale, is now reported.

Researchers demonstrate coherent control of an exciton qubit in a semiconductor quantum dot through optoelectronic means. Such state manipulation of single quantum systems is essential for the development of quantum information systems.

A simply prepared quantum bit that is a hybrid of spin and charge enables full control on the Bloch sphere with π-rotation times of less than 100 picoseconds in two orthogonal directions; the speed arises from the charge-like characteristics, and the spin-like features result in increased quantum coherence.

The Berry curvature is essential to the study of the topological properties of a system, be it solid-state, atomic or photonic. In 1D photonic lattices there is a new clever way of measuring the Berry curvature.

A three-partite cluster state made of one semiconductor spin and two indistinguishable photons is generated from an InGaAs quantum dot embedded in a pillar microcavity. The three-partite entanglement rate is 0.53 MHz at the output of the device.

Coherent control of two flexural modes of a nanoscale oscillator using radiofrequency signals is now demonstrated. This oscillator is analogous to quantum two-level systems such as superconducting circuits and quantum dots, and therefore this technique raises the possibility of information processing using nanomechanical resonators.

The propagation of light in photonic crystals with a honeycomb structure mirrors the behaviour of charges in graphene, therefore allowing for the investigation of electronic properties that cannot otherwise be accessed in graphene itself. This approach is now used to predict unexpected edge states that localize in the bearded edges of hexagonal lattices.

Domain walls forming within magnetic nanowires offer a valuable degree of freedom with which to explore possible future information storage and processing architectures. By taking advantage of the piezoelectric characteristics of perpendicularly magnetized GaMnAsP/GaAs nanowires, large variations in the current-induced domain wall mobilities are obtained.