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  • The energy exchange between two Rydberg atoms is induced and observed on a nanosecond timescale, paving the way for ultrafast quantum gates.

    • Peng Xu
    • Ming-Sheng Zhan
    News & Views
  • The demonstration that diamond nitrogen–vacancy centre technology can optically detect voltages with an impressive sensitivity could bring new opportunities for investigating neurobiology.

    • Milos Nesladek
    • Micha E. Spira
    News & Views
  • A combination of state-of-the-art temporal and spatial shaping techniques enables shaping pulsed laser light in all dimensions in a correlated manner, paving the way for new classes of on-demand space–time wavepackets.

    • Pierre Béjot
    • Bertrand Kibler
    News & Views
  • A photonic quantum heat engine based on superradiance — many-atom quantum coherence — is shown to deliver enhanced operation, with an efficiency no longer bounded by the Carnot limit.

    • Moochan Kim
    • Marlan Scully
    • Anatoly Svidzinsky
    News & Views
  • Nitrogen-vacancy centres in surface-engineered diamond are demonstrated to operate as charge-sensitive fluorescent reporters, enabling an optical scheme for voltage recording in physical and biological systems.

    • D. J. McCloskey
    • N. Dontschuk
    • D. A. Simpson
    Article
  • Under near-infrared-light excitation, anti-Stokes-shift superfluorescence is observed near 590 nm at room temperature in a medium of lanthanide-doped upconversion nanoparticles. The spectral width and radiative decay lifetime are 2 nm and 46 ns, respectively, in the single-nanoparticle case.

    • Kai Huang
    • Kory Kevin Green
    • Shuang Fang Lim
    Article
  • Multilayered ferroelectric NbOI2 crystals with sub-100-nm thickness exhibit efficient second harmonic generation, paving the way for on-chip nonlinear optical components.

    • Rupert F. Oulton
    • Jefferson Flórez
    • Alex S. Clark
    News & Views
  • A new method enables precise control of spin qubits in diamond by selectively activating them with a laser beam, thus paving the way to the control of spin qubits in dense arrays for applications in quantum technology.

    • Tim Hugo Taminiau
    News & Views
  • The hardest barrier in the way to topological control over light with magnetic fields is extremely weak magneto-optic coupling. Now, strong light-matter coupling in an optical cavity has been used to reach record energy splitting values for photonic spins in magnetic fields. This is a potential game changer for topological photonics.

    • Anton Nalitov
    News & Views
  • An ultrabroadband femtosecond enhancement cavity is developed, using gold-coated mirrors and a wedged-diamond-plate input coupler. Simultaneous enhancement of a 22–40 THz offset-free frequency comb allows cavity-enhanced time-domain spectroscopy of gas mixtures based on electro-optic sampling in the mid-infrared range.

    • Philipp Sulzer
    • Maximilian Högner
    • Ioachim Pupeza
    Letter Open Access
  • The presence of topologically protected edge states is usually determined by angular-resolved photoelectron spectroscopy, requiring clean surfaces and ultrahigh vacuum. Now, an all-optical technique, based on high-harmonic radiation, has been shown to detect topological phase transitions under ambient conditions.

    • Dieter Bauer
    News & Views