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Volume 16 Issue 10, October 2022

Ultrafast Rydberg interactions

Artistic impression of the dipole–dipole interactions between two closely spaced, optically trapped Rydberg atoms that have been excited by a laser pulse. As such interactions are ultrafast and coherent they are promising for realizing a quantum gate.

See Chew et al. and Xu and Zhan

Image: Takafumi Tomita, Institute for Molecular Science, Natural Institutes of Natural Sciences. Cover Design: Bethany Vukomanovic.

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


  • 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
  • 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
Top of page ⤴


  • 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
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  • 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
  • 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
  • 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
Top of page ⤴


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