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  • 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
  • Researchers demonstrate a method based on circularly polarized laser-field-driven high-harmonic generation for probing non-trivial and trivial topological phases in a three-dimensional topological insulator.

    • Christian Heide
    • Yuki Kobayashi
    • Shambhu Ghimire
  • Optical fibres can now directly generate a variety of Bessel beams thanks to custom-designed, intricate 3D-printed structures applied to their tips.

    • Siddharth Ramachandran
    News & Views
  • Gabriel Popescu passed away in June 2022. He will be remembered as a creative leader in biophotonics, with pioneering contributions to quantitative phase imaging and spectroscopy, an engaging collaborator and a dear friend.

    • Natan T. Shaked
    • YongKeun Park
    • Peter T. C. So
  • Up to six photons in a Greenberger–Horne–Zeilinger state are sequentially generated by using a Rydberg superatom—a mesoscopic atomic ensemble under the condition of strong Rydberg blockade. The efficiency scaling factor for adding one photon is 0.27.

    • Chao-Wei Yang
    • Yong Yu
    • Jian-Wei Pan
  • Although optical communications continue to be the main driver for integrated photonics, new applications are emerging in computing and neural networks. That was the message from this year’s European Conference on Integrated Optics in Milan.

    • Giampaolo Pitruzzello
    Meeting Report
  • Breaking reciprocity at the nanoscale can produce directional formation of images due to the asymmetric nonlinear optical response of subwavelength anisotropic resonators. The self-induced passive non-reciprocity has advantages compared to magnet or time modulation approaches and may impact both classical and quantum photonics.

    • Christos Argyropoulos
    News & Views
  • A micropillar cavity that can impart a phase shift to single photons offers a promising route to scalable quantum information processing with light.

    • Stephan Dürr
    News & Views
  • The 2022 Wolf Prize in Physics has been awarded to Paul Corkum, Anne L’Huillier and Ferenc Krausz for their pioneering contributions to ultrafast laser science. Nature Photonics spoke to them about the milestones, challenges and future opportunities for the field.

    • Giampaolo Pitruzzello
  • Researchers exploit the quadratic nonlinearity of lithium niobate nanowaveguides and demonstrate cavity-free all-optical switching. Switching energies down to 80 fJ, switching times down to ~46 fs and energy–time products of 3.7 × 10−27 J s are shown.

    • Qiushi Guo
    • Ryoto Sekine
    • Alireza Marandi
  • Microwave-driven holonomic quantum gates on an optically selected electron spin in a nitrogen-vacancy centre in diamond are demonstrated. Optically addressable entanglement is generated between the electron and adjacent nitrogen nuclear spin.

    • Yuhei Sekiguchi
    • Kazuki Matsushita
    • Hideo Kosaka
  • A superradiant photonic engine is developed by using a 138Ba atomic beam and a high-finesse optical cavity. The mirrors of a Fabry–Pérot cavity act as the piston of an engine. The achieved engine temperature and efficiency are 1.5 × 105 K and 98%, respectively.

    • Jinuk Kim
    • Seung-hoon Oh
    • Kyungwon An