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Characterizing higher order nonlinearities and responses to optical excitations in materials is challenging. Here, the authors use high harmonic generation in sapphire crystals to extract higher order susceptibilities and characterize the nonlinear electronic response directly from experimental measurements.

Attosecond metrology in vacuum-ultraviolet. The study demonstrates vacuum-ultraviolet attosecond pulse generation in laser-driven semiconductors and a new spectral window for attosecond spectroscopy in natural systems across all states of matter.

A self-accelerating electronic wave packet can acquire a phase akin to the Aharonov–Bohm effect, but in the absence of a magnetic field.

Emulating condensed-matter physics with ground-state atoms trapped in optical lattices has come a long way. But excite the atoms into higher orbital states, and a whole new world of exotic states appears.

Comprehensively understanding the ultrafast dynamics of the insulator-to-metal transition in vanadium dioxide is a long-standing challenge. Here, the authors measure the electronic and structural phase transitions in the first hundred femtoseconds.

In a trail-blazing experiment 50 years ago, it was observed that photons from far-off stars bunch up. But in fact there's a more general distinction among free, non-interacting particles: bosons bunch, and fermions 'antibunch'.

In presence of inter-system correlations, violations of the laws of thermodynamics become possible. Here, the authors develop a formalism redefining heat, work and thermodynamic laws in terms of quantum conditional entropy, which consistently generalize thermodynamics in correlated scenarios.

The 2005 Nobel laureate, Roy Jay Glauber, sadly passed away on 26 December 2018 at the age of 93. He was highly regarded for his work on the quantum theory of coherence, as well as for his contributions to nuclear physics, scattering theory and statistical mechanics.

Muñoz-Gil and colleagues report the results of an open challenge where they benchmarked algorithms for the characterization of motion changes in single-particle tracking. By ranking methods on simulations, the competition revealed strengths and limitations of AI and classic approaches, guiding researchers toward optimal tools.

Numerous correlated materials exhibit an in-plane anisotropic ground state but their origin is unclear. Here the authors control the orientation of orbital domains in a manganite using the polarization of terahertz pulses, which can be explained by field-induced enhancement of the electron interactions.

The detection of topological invariants in the bulk remains challenging even in state-of-the-art experiments. Here, Cardanoet al. propose a method to read-out the Zak phases and topological invariants in one-dimensional chiral systems and detect those in a photonic quantum walk of twisted photons.

Deviations from Brownian motion leading to anomalous diffusion are ubiquitously found in transport dynamics but often difficult to characterize. Here the authors compare approaches for single trajectory analysis through an open competition, showing that machine learning methods outperform classical approaches.

Quantum states of matter with topological order are of great fundamental — and potential practical — interest. Polar molecules stored in optical lattices could offer a platform for realizing such 'exotic' states.

The still-developing understanding of topologically non-trivial phases of matter has led to new mechanisms for unconventional many-body behaviour. Here the authors present a model where the symmetry needed for a symmetry-protected topological phase only emerges after the formation of long-range order.

Spin models appear in several fields of physics and beyond, but solving many of them is a task for which no general efficient classical algorithm is known to exist. Here the authors demonstrate how a variety of spin glass models can be implemented and solved, via quantum simulation, in a system of trapped ions.

In strong field ionization, entanglement between an electron and an ion has been discussed previously. Here the authors explore orbital angular momentum entanglement between the electrons released in non-sequential double ionization.

The polarization structure around polarization singularities can exhibit arbitrary fractional rotations when tracing around the singularity, due to an underlying topology of a torus knot imprinted by the chosen ratio of frequencies contained in the light beam.

We demonstrate attosecond-resolved generation and control of ultrafast squeezed light via four-wave mixing, directly measuring quantum uncertainty dynamics in real time and enabling petahertz-scale secure communication, advancing ultrafast quantum optics and technologies.

In recent years, progress has been made towards using cold atomic gases to study the role of disorder in many-body systems. This line of research might offer the key to solving open questions in solid-state physics, but should also provide a new outlook on disordered systems in its own right.

Schrödinger cat states are observed in intense laser–atom interactions. These are a superposition of the initial state of the laser and the coherent state that results from the interaction between the light and atoms.

Highly correlated quantum phases in materials like 1T-TiSe₂ arise from complex interactions, yet the mechanisms driving charge density waves remain debated. Here, the authors employ high-harmonic generation spectroscopy to explore these phase transitions, revealing insights into the interplay of electron-phonon and excitonic mechanisms.

Artificial honeycomb lattices offer a tunable platform for studying massless Dirac quasiparticles, and their topological and correlated phases.

Quantum simulators study important models of condensed matter and high-energy physics. Research on synthetic dimensions has paved the way for studying exotic phenomena, such as curved space-times, topological phases of matter, lattice gauge theories, twistronics without a twist, and more