Resolving the gravitational redshift across a millimetre-scale atomic sample.

@article{Bothwell2022ResolvingTG,
  title={Resolving the gravitational redshift across a millimetre-scale atomic sample.},
  author={Tobias Bothwell and Colin J. Kennedy and Alexander Aeppli and Dhruv Kedar and John M. Robinson and Eric Oelker and Alexander Staron and Jun Ye},
  journal={Nature},
  year={2022},
  volume={602 7897},
  pages={
          420-424
        }
}
Einstein's theory of general relativity states that clocks at different gravitational potentials tick at different rates relative to lab coordinates-an effect known as the gravitational redshift1. As fundamental probes of space and time, atomic clocks have long served to test this prediction at distance scales from 30 centimetres to thousands of kilometres2-4. Ultimately, clocks will enable the study of the union of general relativity and quantum mechanics once they become sensitive to the… 
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Background Citations
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Methods Citations
3

25 Citations

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References

SHOWING 1-10 OF 53 REFERENCES
Gravitational Redshift Test Using Eccentric Galileo Satellites.
We report on a new test of the gravitational redshift and thus of local position invariance, an integral part of the Einstein equivalence principle, which is the foundation of general relativity and…
Test of general relativity by a pair of transportable optical lattice clocks
A clock at a higher altitude ticks faster than one at a lower altitude, in accordance with Einstein’s theory of general relativity. The outstanding stability and accuracy of optical clocks, at 10 −18…
Optical clock comparison for Lorentz symmetry testing
TLDR
Agreement between two single-ion clocks is demonstrated experimentally at the 10−18 level over a six-month period, confirming a key postulate of Einstein’s theory of relativity with hundredfold-improved precision.
Precision Metrology Meets Cosmology: Improved Constraints on Ultralight Dark Matter from Atom-Cavity Frequency Comparisons.
We conduct frequency comparisons between a state-of-the-art strontium optical lattice clock, a cryogenic crystalline silicon cavity, and a hydrogen maser to set new bounds on the coupling of…
Systematic evaluation of an atomic clock at 2 × 10−18 total uncertainty
TLDR
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.
A Fermi-degenerate three-dimensional optical lattice clock
TLDR
A scalable solution is demonstrated that takes advantage of the high, correlated density of a degenerate Fermi gas in a three-dimensional (3D) optical lattice to guard against on-site interaction shifts.
Test of the Gravitational Redshift with Galileo Satellites in an Eccentric Orbit.
TLDR
An analysis of approximately three years of data from these satellites including three different clocks determines the test parameter quantifying a potential violation of the combined effects of the gravitational redshift and the relativistic Doppler shift.
Half-minute-scale atomic coherence and high relative stability in a tweezer clock.
TLDR
This work leverages the favourable properties of tweezer-trapped alkaline-earth (strontium-88) atoms and introduces a hybrid approach to tailoring optical potentials that balances scalability, high-fidelity state preparation, site-resolved readout and preservation of atomic coherence.
Gravitational wave detection with optical lattice atomic clocks
We propose a space-based gravitational wave (GW) detector consisting of two spatially separated, drag-free satellites sharing ultrastable optical laser light over a single baseline. Each satellite…
A Quantum Many-Body Spin System in an Optical Lattice Clock
TLDR
A many-body Hamiltonian is derived that describes the experimental observation of atomic spin coherence decay, density-dependent frequency shifts, severely distorted lineshapes, and correlated spin noise that opens the door to further explorations of quantum many- body effects and entanglement through use of highly coherent and precisely controlled optical lattice clocks.
...
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