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… 
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
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
Direct laser cooling of calcium monohydride molecules
We demonstrate optical cycling and laser cooling of a cryogenic buffer-gas beam of calcium monohydride (CaH) molecules. We measure vibrational branching ratios for laser cooling transitions for both
Photoionisation cross sections of ultracold 88Srin 1P1 and 3S1 states at 390 nm and the resultingblue-detuned magic wavelength optical lattice clock constraints
: We present the measurements of the photoionisation cross sections of the excited 1 P 1 and 3 S 1 states of ultracold 88 Sr atoms at 389.889 nm wavelength, which is the magic wavelength of the 1 S 0
Universal visible emitters in nanoscale integrated photonics
: Visible wavelengths of light control the quantum matter of atoms and molecules and are foundational for quantum technologies, including computers, sensors, and clocks. The development of visible
Laser-actuated hermetic seals for integrated atomic devices
Atomic devices such as atomic clocks and optically-pumped magnetometers rely on the interrogation of atoms contained in a cell whose inner content has to meet high standards of purity and accuracy.


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
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
A Quantum Many-Body Spin System in an Optical Lattice Clock
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.