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A. Kuhl ¹, S. Koke¹, E. Benkler¹, M. Giunta ^3,4, L. Maisenbacher ³, A. Matveev³, S. Dörscher ¹, R. Schwarz¹, A. Al-Masoudi¹, T.W. Hänsch³, Th. Udem ³, R. Holzwarth^3,4, and C. Lisdat ^1,*

¹Physikalisch-Technische Bundesanstalt, Bundesallee 100, 38116 Braunschweig, Germany
²Institut für Erdmessung, Leibniz Universität Hannover (LUH), Schneiderberg 50, 30167 Hannover, Germany
³Max-Planck-Institut für Quantenoptik, Hans-Kopfermann-Straße 1, 85748 Garching, Germany
⁴Menlo Systems GmbH, Bunsenstraße 5, 82152 Martinsried, Germany

^*Corresponding author: christian.lisdat@ptb.de
^†J.G. and I.N. contributed equally to this work.

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Articles Citing

Long-distance chronometric leveling with a portable optical clock

High-stability optical clock based on a continuously ground-state cooled Al+ ion without compromising its accuracy

Atomic Clock Frequency Ratios with Fractional Uncertainty ≤3.2×10−18

Nuclear Spin Quenching of the S21/2→F27/2 Electric Octupole Transition in Yb+173

Quasicontinuous sub- μK strontium source without a high-finesse cavity-stabilized laser

General relativity and geodesy

Cross-Spectrum Phase Noise Measurements of Ultrastable Photonic Microwave Oscillators

Experiments of Determining Geopotential Difference Between Two Remote Sites Using Two Hydrogen Clocks

Determining of Geopotential Difference With Multi-GNSS Undifferenced Time–Frequency Signals

Quantum Sensing for Systems-Level Technologies and Applications

Geopotential and Vertical Displacement Effects of Time-Variable Geophysical Processes on Chronometric Leveling

The QTF Backbone: proposal for a nationwide optical fibre backbone in Germany for quantum technology and time and frequency metrology

Research progress on precision measurement based on optical clocks

Theoretical calculation of hyperfine structure constants, Landé g factors, and lifetimes of the 5s4d ³D_1,2,3, ¹D₂ and 5s6s ³S₁ states in strontium based on the multi-configuration Dirac-Hartree-Fock method

Bayesian frequency metrology with optimal Ramsey interferometry in optical atomic clocks

88Sr+ optical clock with 7.9×10−19 systematic uncertainty and measurement of its absolute frequency with 9.8×10−17 uncertainty

Direct measurement of the P03 clock state natural lifetime in Sr87

Perspective: Practical atom-based quantum sensors

Lifetime measurement of the 5s5p1P1 state in strontium

Coordinated international comparisons between optical clocks connected via fiber and satellite links

Ultra-stable transportable ultraviolet clock laser using cancellation between photo-thermal and photo-birefringence noise

Plug-and-play solution for characterizing two-way optical frequency transfer over free-space

Improved absolute frequency measurement of 171Yb at NMIJ with uncertainty below 2 × 10 − 16

NTSC SrII optical lattice clock with uncertainty of 2 × 10 − 18

Transportable optical lattice clocks and general relativity

Investigation of the chronometric leveling technology use possibility to eliminate systematic errors in the state leveling network

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