# Transportable Optical Lattice Clock with 7×10^{-17} Uncertainty.

@article{Koller2017TransportableOL,
title={Transportable Optical Lattice Clock with 7×10^\{-17\} Uncertainty.},
author={Silvio Koller and Jacopo Grotti and Stefan Vogt and Ali Al-Masoudi and S{\"o}ren D{\"o}rscher and Sebastian H{\"a}fner and Uwe Sterr and Christian Lisdat},
journal={Physical review letters},
year={2017},
volume={118 7},
pages={
073601
}
}
• Published 20 September 2016
• Physics
• Physical review letters
We present a transportable optical clock (TOC) with ^{87}Sr. Its complete characterization against a stationary lattice clock resulted in a systematic uncertainty of 7.4×10^{-17}, which is currently limited by the statistics of the determination of the residual lattice light shift, and an instability of 1.3×10^{-15}/sqrt[τ] with an averaging time τ in seconds. Measurements confirm that the systematic uncertainty can be reduced to below the design goal of 1×10^{-17}. To our knowledge, these are…
134 Citations

## Figures and Tables from this paper

### Compact Optical Atomic Clock Based on a Two-Photon Transition in Rubidium

• Physics
• 2018
Extra-laboratory atomic clocks are necessary for a wide array of applications (e.g. satellite-based navigation and communication). Building upon existing vapor cell and laser technologies, we

### Development and characterization of a transportable aluminum ion quantum logic optical clock setup

At the time of writing, state of the art stationary optical clocks reach 10−18 systematic fractional frequency uncertainty, which allows for the search of new physics beyond the standard model and

### A transportable clock laser system with an instability of $1.6 \times 10^{-16}$

• Physics
• 2022
We present a transportable ultra-stable clock laser system based on a Fabry-Pérot cavity with crystalline Al 0 . 92 Ga 0 . 08 As/GaAs mirror coatings, fused silica (FS) mirror substrates and a 20

### OPTICAL LATTICE CLOCK WITH AN AMPLIFIED LASER DIODE

Optical lattice clocks occupy a very important position in metrological research. Diffused worldwide, they are a strong candidate for a future redefinition of the second of the International System

### Towards an optical clock for space: Compact, high-performance optical lattice clock based on bosonic atoms

• Physics
Physical Review A
• 2018
Optical clocks operated on satellites are expected to open up new opportunities in time transfer, geodesy, fundamental physics, and satellite navigation. Here we demonstrate an important first step

### A Brillouin laser optical atomic clock

• Physics
• 2020
Over the last decade, optical atomic clocks have surpassed their microwave counterparts and now offer the ability to measure time with an increase in precision of two orders of magnitude or more.

### Uncertainty Evaluation of an 171Yb Optical Lattice Clock at NMIJ

• Physics
IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control
• 2018
The uncertainties of two sensitivity coefficients for the lattice-induced hyperpolarizability shift incorporated in a widely used light shift model by RIKEN and the second-order Zeeman shift are improved compared with the uncertainties of previous coefficients.

### Recent Advances Concerning the 87Sr Optical Lattice Clock at the National Time Service Center

• Physics
Applied Sciences
• 2018
We review recent experimental progress concerning the 87Sr optical lattice clock at the National Time Service Center in China. Hertz-level spectroscopy of the 87Sr clock transition for the optical

### Geodesy and metrology with a transportable optical clock

• Physics
• 2018
The first field measurement campaign with a transportable 87Sr optical lattice clock is reported, using it to determine the gravity potential difference between the middle of a mountain and a location 90 km away, exploiting both local and remote clock comparisons to eliminate potential clock errors.

### Towards a transportable aluminium ion quantum logic optical clock.

• Physics
The Review of scientific instruments
• 2019
A transportable optical clock based on a single trapped aluminum ion, which is interrogated via quantum logic spectroscopy, is developed, employing singly charged calcium as the logic ion for sympathetic cooling, state preparation, and readout.

## References

SHOWING 1-10 OF 70 REFERENCES

### A transportable optical lattice clock

• Physics
• 2016
We present the experimental setup and first results of PTB's transportable 87Sr clock. It consists of a physics package, several compact laser breadboards, and a transportable high finesse cavity for

### Frequency comparison of two high-accuracy Al+ optical clocks.

• Physics
Physical review letters
• 2010
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.

### Noise and instability of an optical lattice clock

• Physics
• 2015
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 projection

### Experimental realization of an optical second with strontium lattice clocks.

• Physics
Nature communications
• 2013
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).

### Development of a strontium optical lattice clock for the SOC mission on the ISS

• Physics
SPIE Photonics Europe
• 2016
The ESA mission “Space Optical Clock” project aims at operating an optical lattice clock on the ISS in approximately 2023. The scientific goals of the mission are to perform tests of fundamental

### A low maintenance Sr optical lattice clock

• Physics
• 2016
We describe the Sr optical lattice clock apparatus at NPL with particular emphasis on techniques used to increase reliability and minimise the human requirement in its operation. Central to this is a

### Realization of a timescale with an accurate optical lattice clock

• Physics
• 2016
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

### An optical lattice clock with accuracy and stability at the 10−18 level

• Physics
Nature
• 2014
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.

### Systematic evaluation of an atomic clock at 2 × 10−18 total uncertainty

• Physics
Nature communications
• 2015
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.

### Comparing a mercury optical lattice clock with microwave and optical frequency standards

• Physics
• 2016
In this paper we report the evaluation of an optical lattice clock based on neutral mercury with a relative uncertainty of 1.7 × 10 − 16 . Comparing this characterized frequency standard to a 133Cs