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  • Quantum confinement effects offer a more comprehensive understanding of the fundamental processes that drive extreme optical nonlinearities in nano-engineered solids, opening a route to unlocking the potential of high-order harmonic generation.

    • Julien Madéo
    • Keshav M. Dani
    News & Views
  • A method to engineer higher-order interactions between photons provides a route to create non-classical and entangled states across multiple modes.

    • Srivatsan Chakram
    • Kevin He
    • David I. Schuster
  • Magnetic skyrmions—a type of localized spin texture—have been theoretically predicted to annihilate with counterparts known as antiskyrmions. By means of electron microscopy, such annihilation has now been observed in a cubic chiral magnet.

    • Fengshan Zheng
    • Nikolai S. Kiselev
    • Rafal E. Dunin-Borkowski
    Letter Open Access
  • Combinatorial optimization is one of the areas for which quantum computing promises to overcome classical devices. An experiment with arrays of Rydberg atoms now shows how to solve combinatorial graph problems with auxiliary atomic wires.

    • Minhyuk Kim
    • Kangheun Kim
    • Jaewook Ahn
  • The hydrodynamic description of many-body quantum systems is a key part of our understanding of out-of-equilibrium physics. Exotic, highly constrained quantum particles called fractons require a treatment that goes beyond hydrodynamics.

    • Olalla Castro-Alvaredo
    News & Views
  • The hunt for new particles helps to complete our understanding of hadronic matter. The LHCb Collaboration now reports the surprising observation of a doubly charmed tetraquark.

    • Zhiqing Liu
    News & Views
  • The LHCb Collaboration reports the observation of an exotic, narrow, tetraquark state that contains two charm quarks, an up antiquark and a down antiquark.

    • R. Aaij
    • A. S. W. Abdelmotteleb
    • G. Zunica
    Letter Open Access
  • Fractons are particles that can only move in tandem, which substantially affects their thermalization. Below four spatial dimensions, an unconventional dynamical universality class can emerge as thermal fluctuations destroy hydrodynamic behaviour.

    • Paolo Glorioso
    • Jinkang Guo
    • Andrew Lucas
  • Glass, now celebrated with a dedicated International Year, continues to fascinate.

  • The shift of the definition of the kilogram in 2019 away from an artefact to one relying on the Planck constant inspires technological innovation, as Naoki Kuramoto elucidates.

    • Naoki Kuramoto
    Measure for Measure
  • Advances in precision lithography and measurement have made it possible to observe and control the magnetic phase transition in kagome artificial spin ice, which could lead to new technological devices.

    • Susan Kempinger
    News & Views
  • Uncovering structures in temporal networks requires different tools than in their static counterparts. A metric now quantifies whether the nodes with a large number of connections also tend to stay simultaneously connected for longer times.

    • Nicola Pedreschi
    • Demian Battaglia
    • Alain Barrat
  • Against the backdrop of various philosophical accounts, this Comment argues for the need of a human rights approach to scientific progress, which requires us to rethink how we view scientific knowledge.

    • Michela Massimi
  • Two-dimensional model glasses exhibit characteristics in their low-frequency vibrational density of states that can be traced to the quasilocalized dynamics of string-like objects. This finding provides an explanation for a universal feature of glasses known as the boson peak.

    • Lothar Wondraczek
    News & Views
  • The relation between physical properties and structure in amorphous materials is poorly understood. Simulations now show that vibrations of string-like dynamical defects likely govern the low-temperature dynamics in these systems.

    • Yuan-Chao Hu
    • Hajime Tanaka