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

  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},
  volume={602 7897},
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… 
A lab-based test of the gravitational redshift with a miniature clock network
Einstein’s theory of general relativity predicts that when two clocks are compared using light, a clock at a higher gravitational potential will tick faster than an otherwise identical clock at a
UGR tests with atomic clocks and atom interferometers
Atomic interference experiments test the universality of the coupling between matter-energy and gravity at different spacetime points, thus being in principle able to probe possible violations of the
Quantumness of gravity in harmonically trapped particles
This study investigates the quantumness of gravity under the setup of the atomic interferometry. We evaluated interference visibility considering a particle with internal energy levels in a harmonic
Differential clock comparisons with a multiplexed optical lattice clock.
Rapid progress in optical atomic clock performance has advanced the frontiers of timekeeping, metrology and quantum science1-3. Despite considerable efforts, the instabilities of most optical clocks
Light propagation and atom interferometry in gravity and dilaton fields
Dark matter or violations of the Einstein equivalence principle influence the motion of atoms, their internal states as well as electromagnetic fields, thus causing a signature in the signal of atomic
Spurious Radial Migration from Relativistic Effects in the Milky Way Disk
  • A. Loeb
  • Physics
    Research Notes of the AAS
  • 2022
The gradient of the gravitational redshift in the potential of the Milky Way induces an apparent spurious radial migration. I show that this effect is simply related to the local acceleration, which
Hamiltonian engineering of spin-orbit coupled fermions in a Wannier-Stark optical lattice clock
Engineering a Hamiltonian system with tunable interactions provides opportunities to optimize performance for quantum sensing and explore emerging phenomena of many-body systems. An optical lattice
Determining the atom number from detection noise in a one-dimensional optical lattice clock
In this paper, we demonstrate in situ synchronous frequency comparison between distinct regions in a one-dimensional optical lattice. The synchronous comparison instability is well below the Dick
Pauli blocking of stimulated emission in a degenerate Fermi gas
The Pauli exclusion principle in quantum mechanics has a profound influence on the structure of matter and on interactions between fermions. Almost 30 years ago it was predicted that the Pauli
Spin-squeezing swapping for differential measurements with atom interferometers and clocks
Thanks to common-mode noise rejection, di ff erential configurations are crucial for realistic applications of phase and frequency estimation with atom interferometers. Di ff erential interferometry can


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
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
Atomic clock performance beyond the geodetic limit
The passage of time is tracked by counting oscillations of a frequency reference, such as Earth's revolutions or swings of a pendulum. By referencing atomic transitions, frequency (and thus time) can
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.
A Fermi-degenerate three-dimensional optical lattice clock
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.
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.
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