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  • Photon bound states are quantum states of light that emerge in systems with ultrahigh optical non-linearities. A single artificial atom was used to study the dynamics of these states, revealing that the number of photons within the pulse determines the time delay after the pulse scatters off the atom.

    Research Briefing
  • The realization of ultracold molecules in higher bands of an optical lattice sets the stage for the study of the interplay between orbital physics and the Bose–Einstein condensation and Bardeen–Cooper–Schrieffer superfluidity crossover.

    • Yann Kiefer
    • Max Hachmann
    • Andreas Hemmerich
    Article Open Access
  • Measurements on a single artificial atom—a quantum dot—coupled to an optical cavity show scattering dynamics that depend on the number of photons involved in the light–matter interaction, which is a signature of stimulated emission.

    • Natasha Tomm
    • Sahand Mahmoodian
    • Richard J. Warburton
    Article Open Access
  • Controlling the spatial distribution of optically active spin defects in solids is a long-standing goal in the quantum sensing and simulation communities. Measurements of the many-body noise generated by the spins were used to verify that a highly coherent and strongly interacting quantum spin system was confined to two dimensions within a diamond substrate.

    Research Briefing
  • Solid-state systems are established candidates to study models of many-body physics but have limited control and readout capabilities. Ensembles of defects in diamond may provide a solution for studying dipolar systems.

    • E. J. Davis
    • B. Ye
    • N. Y. Yao
    Article Open Access
  • The nautical mile and knot were acknowledged by the International Bureau of Weights and Measures. Bart Verberck wonders why this is not the case anymore.

    • Bart Verberck
    Measure for Measure
  • Driven by curiosity and creativity, materials that are diverted from their intended use may lead to surprising insights. We take a moment to celebrate the playful side of physics.

  • The study of complexity of unitary transformations has become central to quantum information theory and, increasingly, quantum field theory and quantum gravity. A proof of how complexity grows with system size demonstrates the power of a geometric approach.

    • Michal P. Heller
    News & Views
  • The discovery of an unexpectedly large thermoelectric response in a 2D material establishes its power to probe the entropy carried by its charge carriers in the hotly debated strange metal phase.

    • Lu Li
    • Dechen Zhang
    News & Views
  • It is very challenging to model hydrogen at high pressures and low temperatures because quantum effects become significant. A state-of-the-art numerical study shows that these effects cause important changes to the predicted phase diagram.

    • Lorenzo Monacelli
    • Michele Casula
    • Francesco Mauri
  • The observation of band structure features typical of the kagome lattice in FeGe suggests that an interplay of magnetism and electronic correlations determines the physics of this material.

    • Xiaokun Teng
    • Ji Seop Oh
    • Ming Yi
  • Local magnetometry measurements on a magnetic Chern insulator suggest that the Berry curvature of the topological band — responsible for the intrinsic magnetism — also enables ultra-low current switching of the magnetization.

    • Yonglong Xie
    News & Views
  • Observations of the Schwinger effect—the creation of matter by electric fields—have been hindered by the high required field strength. A mesoscopic variant of the Schwinger effect has now been realized in graphene transistors.

    • A. Schmitt
    • P. Vallet
    • B. Plaçais
    Article Open Access