Realization of a timescale with an accurate optical lattice clock

  title={Realization of a timescale with an accurate optical lattice clock},
  author={Christian Grebing and Ali Al-Masoudi and Soren Dorscher and Sebastian Hafner and Vladislav Gerginov and Stefan Weyers and Burghard Lipphardt and Fritz Riehle and Uwe Sterr and Christian Lisdat},
  journal={arXiv: Optics},
Optical clocks are not only powerful tools for prime fundamental research, but are also deemed for the redefinition of the SI base unit “second,” as they now surpass the performance of cesium atomic clocks in both accuracy and stability by more than an order of magnitude. However, an important obstacle in this transition has so far been the limited reliability of optical clocks, which made a continuous realization of a timescale impractical. In this paper, we demonstrate how this situation can… Expand

Figures and Tables from this paper

Demonstration of the nearly continuous operation of an171Yb optical lattice clock for half a year
Optical lattice clocks surpass primary Cs microwave clocks in frequency stability and accuracy, and are promising candidates for a redefinition of the second in the International System of UnitsExpand
Optical to microwave clock frequency ratios with a nearly continuous strontium optical lattice clock
Optical lattice clocks are at the forefront of frequency metrology. Both the instability and systematic uncertainty of these clocks have been reported to be two orders of magnitude smaller than theExpand
An optical lattice clock with neutral strontium
Strontium optical lattice clocks can measure the passage of time with extraordinary precision. Capitalising on this precision, we can anticipate the deployment of lattice clocks to search for newExpand
Optical-Clock-Based Time Scale.
A hybrid microwave-optical time scale, which only requires the optical clock to run intermittently while relying upon the ensemble of microwave clocks to serve as the flywheel oscillator, which significantly improves the accuracy in timekeeping and could change the existing time-scale architectures. Expand
Strontium optical lattice clocks : clock comparisons for timescales and fundamental physics applications
This thesis describes the latest progresses regarding the Sr optical lattice clocks at LNE-SYRTE, Observatoire de Paris. Nowadays, the systematic uncertainty and stability of optical clocks are 2Expand
Frequency ratio measurements at 18-digit accuracy using an optical clock network.
  • Medicine
  • Nature
  • 2021
An advance in frequency ratio measurements lays the groundwork for future networks of mobile, airborne and remote optical clocks that will be used to test physical laws, perform relativistic geodesy and substantially improve international timekeeping. Expand
Test of Special Relativity Using a Fiber Network of Optical Clocks.
This work obtains a constraint on the Robertson-Mansouri-Sexl parameter |α|≲1.1×10^{-8}, quantifying a violation of time dilation, thus improving by a factor of around 2 the best known constraint obtained with Ives-Stilwell type experiments. Expand
Single-ion, transportable optical atomic clocks
For the past 15 years, tremendous progress within the fields of laser stabilization, optical frequency combs and atom cooling and trapping have allowed the realization of optical atomic clocks withExpand
Towards Adoption of an Optical Second: Verifying Optical Clocks at the SI Limit
The pursuit of ever more precise measures of time and frequency is likely to lead to the eventual redefinition of the second in terms of an optical atomic transition. To ensure continuity with theExpand
Demonstration of a Timescale Based on a Stable Optical Carrier.
The analysis indicates that this timescale is capable of reaching a stability below 1×10^{-17} after a few months of averaging, making timekeeping at the 10^{-18} level a realistic prospect. Expand


Experimental realization of an optical second with strontium lattice clocks.
An important step in the direction of a possible new definition of the second is presented, and two state-of-the-art strontium optical lattice clocks are proven to agree within their accuracy budget, with a total uncertainty of 1.5 × 10(-16). Expand
Towards a Re-definition of the Second Based on Optical Atomic Clocks
The rapid increase in accuracy and stability of optical atomic clocks compared to the caesium atomic clock as primary standard of time and frequency asks for a future re-definition of the second inExpand
An optical lattice clock with accuracy and stability at the 10−18 level
This work demonstrates a many-atom system that achieves an accuracy of 6.4 × 10−18, which is not only better than a single-ion-based clock, but also reduces the required measurement time by two orders of magnitude. Expand
Systematic evaluation of an atomic clock at 2 × 10−18 total uncertainty
This work performs a new accuracy evaluation of the JILA Sr clock, reducing many systematic uncertainties that limited previous measurements, such as those in the lattice ac Stark shift, the atoms' thermal environment and the atomic response to room-temperature blackbody radiation. Expand
A strontium lattice clock with 3 × 10−17 inaccuracy and its frequency
We have measured the absolute frequency of the optical lattice clock based on 87Sr at PTB with an uncertainty of 3.9 × 10−16 using two caesium fountain clocks. This is close to the accuracy ofExpand
Frequency comparison of two high-accuracy Al+ optical clocks.
An optical clock with a fractional frequency inaccuracy of 8.6x10{-18}, based on quantum logic spectroscopy of an Al+ ion, is constructed, consistent with the accuracy limit of the older clock. Expand
Noise and instability of an optical lattice clock
We present an analysis of the different types of noise from the detection and interrogation laser in our strontium lattice clock. We develop a noise model showing that in our setup quantum projectionExpand
An Atomic Clock with 10–18 Instability
The development and operation of two optical lattice clocks are described, both using spin-polarized, ultracold atomic ytterbium, and an unprecedented atomic clock instability of 1.6 × 10–18 after only 7 hours of averaging is demonstrated. Expand
The absolute frequency of the 87 Sr optical clock transition
The absolute frequency of the 1 S0– 3 P0 clock transition of 87 Sr has been measured to be 429 228 004 229 873.65 (37) Hz using lattice-confined atoms, where the fractional uncertainty of 8.6 × 10Expand
First Evaluation and Frequency Measurement of the Strontium Optical Lattice Clock at NIM
An optical lattice clock based on 87Sr is built at National Institute of Metrology (NIM) of China. The systematic frequency shifts of the clock are evaluated with a total uncertainty of 2.3×10−16. ToExpand