Front Cover: Transportable Strontium Optical Lattice Clocks Operated Outside Laboratory at the Level of 10−18 Uncertainty (Adv. Quantum Technol. 8/2021)

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Laser cooled and trapped atoms in an optical lattice operated at the magic wavelength, as illustrated in the cover image, play a leading part in an ultraprecise optical clock, referred to as an optical lattice clock. In article number 2100015, Noriaki Ohmae and co-workers developed transportable optical lattice clocks that were operated outside a laboratory with a fractional uncertainty of 5.5 × 10−18. Their demonstration will accelerate field applications of ultraprecise optical clocks, such as a chronometric leveling.