Volume 20

  • No. 6 June 2024

    Neutrinos probe quantum gravity

    The existence of fluctuations in the metric of spacetime induced by quantum gravity would have an impact on neutrinos produced in cosmic-ray air showers. They would lose their quantum coherence, causing their flavour oscillations to change. The IceCube collaboration reports a search for this effect but finds no evidence for it, thus constraining the magnitude of anomalous decoherence from quantum gravity.

    See IceCube Collaboration

  • No. 5 May 2024

    Non-classical correlations

    Quantum devices need to be linked together in such a way that entanglement can be shared between them. Meesala et al. demonstrate a step towards this goal by developing a transducer capable of generating microwave-optical photon pairs that can be used to share non-classical correlations between an optical link and a superconducting quantum device.

    See Meesala et al.

  • No. 4 April 2024

    Material time in a material world

    The way in which glassy materials age can be difficult to describe. The concept of material time allows for the description of this physical ageing in a linear way. Multispeckle dynamic light scattering experiments now provide experimental access to material time and show that intensity fluctuations become statistically reversible when referenced in this way.

    See Böhmer

  • No. 3 March 2024

    Universal dynamics out of equilibrium

    The dynamics of isolated quantum many-body systems far from equilibrium is a field of study that pertains to many situations, including ultracold atoms, quantum spin magnets, and quark–gluon matter. Here, magnetization measurements in a spinor atomic gas show a way to classify universal dynamics based on symmetry and topology.

    See Huh et al. and Prüfer

  • No. 2 February 2024

    Emergent higher orders

    The dynamics of complex systems are often modelled using low-rank matrices, but the formal validity of this method has not yet been confirmed. Thibeault et al. present an analysis of random networks and real-world data that sheds light on this low-rank hypothesis and its implications.

    See Thibeault et al. and Gao

  • No. 1 January 2024

    Coherent control in chaotic cavities

    Non-Hermitian physics enables dynamic control of optical behaviour in real time, such as reflectionless scattering modes, which have now been demonstrated in a chaotic photonic microcavity.

    See Jiang et al. and Stone