Quantum computers are big news, but the quantum world can seem mysterious and confusing. In this Outline we explain the differences between classical and quantum computing, and suggest how quantum computers could transform science and technology.
Science needs reason to be trusted pp316 - 317 Sabine Hossenfelder doi:10.1038/nphys4079 That we now live in the grip of post-factualism would seem naturally repellent to most physicists. But in championing theory without demanding empirical evidence, we're guilty of ignoring the facts ourselves.
CP violation: Another piece of the puzzle p322 Gauthier Durieux and Yuval Grossman doi:10.1038/nphys4068 A study of Λb baryon decays has provided the first direct experimental evidence that spinning matter and antimatter differ. This result may help us understand the puzzling matter-antimatter imbalance in the Universe.
Origin of life: Division for multiplication pp323 - 324 Ramin Golestanian doi:10.1038/nphys3998 Early forms of life could have started by molecular compounds coming together under conditions dense enough to promote reactions. But how might these droplets have undergone what we now know as cell division? The answer may be simpler than we think.
Colloids: A microscopic army pp324 - 326 Pietro Tierno doi:10.1038/nphys3992 Ensembles of magnetic colloids can undergo an instability triggering the formation of clusters that move faster than the particles themselves. The many-body process relies on hydrodynamics alone and may prove useful for load delivery in fluidics.
Hydrodynamics: Modus vivendi pp326 - 327 Vicente I. Fernandez and Roman Stocker doi:10.1038/nphys4004 Striking visualization of the flows generated by starfish larvae in their fluid environment offers unique insight into how these organisms live. The beautiful vortices they create betray a dynamic mechanism for trading swimming off against feeding.
Optical-field-controlled photoemission from plasmonic nanoparticles pp335 - 339 William P. Putnam, Richard G. Hobbs, Phillip D. Keathley, Karl K. Berggren and Franz X. Kärtner doi:10.1038/nphys3978 Photoemission is usually driven by the energy of the illuminating laser pulses, but in the strong-field regime, the photoemission from an array of plasmonic nanoparticles is shown to be controlled by the light's electric field.
Observation of topological valley transport of sound in sonic crystals pp369 - 374 Jiuyang Lu, Chunyin Qiu, Liping Ye, Xiying Fan, Manzhu Ke et al. doi:10.1038/nphys3999 Valleytronics — exploiting a system's pseudospin degree of freedom — is being increasingly explored in sonic crystals. Now, valley transport of sound is reported for a macroscopic triangular-lattice array of rod-like scatterers in a 2D air waveguide.
Unstable fronts and motile structures formed by microrollers pp375 - 379 Michelle Driscoll, Blaise Delmotte, Mena Youssef, Stefano Sacanna, Aleksandar Donev et al. doi:10.1038/nphys3970 Collections of rolling colloids are shown to pinch off into motile clusters resembling droplets sliding down a windshield. These stable dynamic structures are formed through a fingering instability that relies on hydrodynamic interactions alone.
A laboratory model for deep-seated jets on the gas giants pp387 - 390 Simon Cabanes, Jonathan Aurnou, Benjamin Favier and Michael Le Bars doi:10.1038/nphys4001 A laboratory study of turbulent flows reproduces the properties of jets in the atmospheres of gas giants, providing a better understanding of how these jets could extend deep into the planetary atmosphere.
Control of the millisecond spin lifetime of an electrically probed atom pp403 - 407 William Paul, Kai Yang, Susanne Baumann, Niklas Romming, Taeyoung Choi et al. doi:10.1038/nphys3965 Single atoms on a surface can be useful in spintronics applications, but their spin lifetime is limited by relaxation. By cleverly employing an STM tip, one can probe the spin dynamics and disentangle different effects leading to relaxation.
Growth and division of active droplets provides a model for protocells pp408 - 413 David Zwicker, Rabea Seyboldt, Christoph A. Weber, Anthony A. Hyman and Frank Jülicher doi:10.1038/nphys3984 Droplets are an appealing picture for protocells in origin-of-life studies, but it/'s unclear how they would have propagated by growth and division. Theory suggests that chemically active droplets spontaneously split into equal daughter droplets.
Tricks for ticks p414 Hidetoshi Katori doi:10.1038/nphys4090 Optical-lattice clocks have pushed the limits of frequency measurement — to such an extent that a tiny difference in altitude affects the clock's tick rate, as Hidetoshi Katori elucidates.
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