Optical frequency ratio of a 171Yb+ single-ion clock and a 87Sr lattice clock

Direct comparisons of European primary and secondary frequency standards via satellite techniques

(2020) Franziska Riedel et al.   METROLOGIA

Test of general relativity by a pair of transportable optical lattice clocks

(2020) Masao Takamoto et al.   Nature Photonics

Direct measurement of the frequency ratio for Hg and Yb optical lattice clocks and closure of the Hg/Yb/Sr loop

(2020) Noriaki Ohmae et al.   OPTICS EXPRESS

Search for transient variations of the fine structure constant and dark matter using fiber-linked optical atomic clocks

(2020) Benjamin M Roberts et al.   NEW JOURNAL OF PHYSICS

Absolute frequency of 87Sr at 1.8×10-16 uncertainty by reference to remote Primary Frequency Standards

(2020) Nils Nemitz et al.   METROLOGIA

A compact and robust cooling laser system for an optical strontium lattice clock

(2019) Roman Schwarz et al.   REVIEW OF SCIENTIFIC INSTRUMENTS

Optical clock comparison for Lorentz symmetry testing

(2019) Christian Sanner et al.   NATURE

The unit of time: Present and future directions

(2019) Sébastien Bize   COMPTES RENDUS PHYSIQUE

Towards the optical second: verifying optical clocks at the SI limit

(2019) W. F. McGrew et al.   Optica

Demonstration of 4.8 × 10−17 stability at 1 s for two independent optical clocks

(2019) E. Oelker et al.   Nature Photonics

Al+27 Quantum-Logic Clock with a Systematic Uncertainty below 10−18

(2019) S. M. Brewer et al.   PHYSICAL REVIEW LETTERS

JILA SrI optical lattice clock with uncertainty of $2.0 \times 10^{-18}$

(2019) Tobias Bothwell et al.   METROLOGIA

Advanced Satellite-Based Frequency Transfer at the 10−16 Level

(2018) Miho Fujieda et al.   IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL

Geodesy and metrology with a transportable optical clock

(2018) Jacopo Grotti et al.   Nature Physics

The CIPM list of recommended frequency standard values: guidelines and procedures

(2018) Fritz Riehle et al.   METROLOGIA

Atomic clock performance enabling geodesy below the centimetre level

(2018) W. F. McGrew et al.   NATURE

Geodetic methods to determine the relativistic redshift at the level of 10 $$^{-18}$$ - 18 in the context of international timescales: a review and practical results

(2017) Heiner Denker et al.   JOURNAL OF GEODESY

Consensus building for interlaboratory studies, key comparisons, and meta-analysis

(2017) Amanda Koepke et al.   METROLOGIA

Transportable Optical Lattice Clock with 7×10−17 Uncertainty

(2017) S. B. Koller et al.   PHYSICAL REVIEW LETTERS

1.5  μm Lasers with Sub-10 mHz Linewidth

(2017) D. G. Matei et al.   PHYSICAL REVIEW LETTERS

Phase Analysis for Frequency Standards in the Microwave and Optical Domains

(2016) Michael Kazda et al.   IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL

On the evaluation of ultra-high-precision frequency ratio measurements: examining closed loops in a graph theory framework

(2016) L Robertsson   METROLOGIA

Frequency ratio of Yb and Sr clocks with 5 × 10−17 uncertainty at 150 seconds averaging time

(2016) Nils Nemitz et al.   Nature Photonics

Ultrastable optical clock with two cold-atom ensembles

(2016) M. Schioppo et al.   Nature Photonics

Single-Ion Atomic Clock with3×10−18Systematic Uncertainty

(2016) N. Huntemann et al.   PHYSICAL REVIEW LETTERS

A clock network for geodesy and fundamental science

(2016) C. Lisdat et al.   Nature Communications

Realization of a timescale with an accurate optical lattice clock

(2016) Christian Grebing et al.   Optica

Frequency ratios of Sr, Yb, and Hg based optical lattice clocks and their applications

(2015) Masao Takamoto et al.   COMPTES RENDUS PHYSIQUE

Least-squares analysis of clock frequency comparison data to deduce optimized frequency and frequency ratio values

(2015) H S Margolis et al.   METROLOGIA

8  ×  10^−17 fractional laser frequency instability with a long room-temperature cavity

(2015) Sebastian Häfner et al.   OPTICS LETTERS

Noise and instability of an optical lattice clock

(2015) Ali Al-Masoudi et al.   PHYSICAL REVIEW A

Strategies for reducing the light shift in atomic clocks

(2015) Hidetoshi Katori et al.   PHYSICAL REVIEW A

Frequency Ratio ofHg199andSr87Optical Lattice Clocks beyond the SI Limit

(2015) Kazuhiro Yamanaka et al.   PHYSICAL REVIEW LETTERS

Optical atomic clocks

(2015) Andrew D. Ludlow et al.   REVIEWS OF MODERN PHYSICS

A strontium lattice clock with 3 × 10−17inaccuracy and its frequency

(2014) Stephan Falke et al.   NEW JOURNAL OF PHYSICS

Frequency Ratio of Two Optical Clock Transitions inYb+171and Constraints on the Time Variation of Fundamental Constants

(2014) R. M. Godun et al.   PHYSICAL REVIEW LETTERS

Improved Limit on a Temporal Variation ofmp/mefrom Comparisons ofYb+and Cs Atomic Clocks

(2014) N. Huntemann et al.   PHYSICAL REVIEW LETTERS

Delivering pulsed and phase stable light to atoms of an optical clock

(2012) S. Falke et al.   APPLIED PHYSICS B-LASERS AND OPTICS

High Accuracy Correction of Blackbody Radiation Shift in an Optical Lattice Clock

(2012) Thomas Middelmann et al.   PHYSICAL REVIEW LETTERS

High-Accuracy Optical Clock Based on the Octupole Transition inYb+171

(2012) N. Huntemann et al.   PHYSICAL REVIEW LETTERS

Tackling the Blackbody Shift in a Strontium Optical Lattice Clock

(2011) T Middelmann et al.   IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT

Hyper-Ramsey spectroscopy of optical clock transitions

(2010) V. I. Yudin et al.   PHYSICAL REVIEW A

Frequency Ratio of Al+ and Hg+ Single-Ion Optical Clocks; Metrology at the 17th Decimal Place

(2008) T. Rosenband et al.   SCIENCE