Direct comparison of two spin-squeezed optical clock ensembles at the 10−17 level
Building scalable quantum systems that demonstrate performance enhancement based on
entanglement is a major goal in quantum computing and metrology. The main challenge …
entanglement is a major goal in quantum computing and metrology. The main challenge …
Free-space dissemination of time and frequency with 10−19 instability over 113 km
Networks of optical clocks find applications in precise navigation,, in efforts to redefine the
fundamental unit of the 'second',,–and in gravitational tests. As the frequency instability for …
fundamental unit of the 'second',,–and in gravitational tests. As the frequency instability for …
Improved limits for violations of local position invariance from atomic clock comparisons
We compare two optical clocks based on the S 2 1/2 (F= 0)→ D 2 3/2 (F= 2) electric
quadrupole (E2) and the S 2 1/2 (F= 0)→ F 2 7/2 (F= 3) electric octupole (E3) transition of Yb …
quadrupole (E2) and the S 2 1/2 (F= 0)→ F 2 7/2 (F= 3) electric octupole (E3) transition of Yb …
Prospects and challenges for squeezing-enhanced optical atomic clocks
Optical atomic clocks are a driving force for precision measurements due to the high
accuracy and stability demonstrated in recent years. While further improvements to the …
accuracy and stability demonstrated in recent years. While further improvements to the …
Search for ultralight dark matter from long-term frequency comparisons of optical and microwave atomic clocks
We search for ultralight scalar dark matter candidates that induce oscillations of the fine
structure constant, the electron and quark masses, and the quantum chromodynamics …
structure constant, the electron and quark masses, and the quantum chromodynamics …
Comparing ultrastable lasers at 7 × 10−17 fractional frequency instability through a 2220 km optical fibre network
Ultrastable lasers are essential tools in optical frequency metrology enabling unprecedented
measurement precision that impacts on fields such as atomic timekee**, tests of …
measurement precision that impacts on fields such as atomic timekee**, tests of …
New horizons: Scalar and vector ultralight dark matter
The last decade has seen unprecedented effort in dark matter model building at all mass
scales coupled with the design of numerous new detection strategies. Transformative …
scales coupled with the design of numerous new detection strategies. Transformative …
Testing gravity with cold atom interferometry: results and prospects
GM Tino - Quantum Science and Technology, 2021 - iopscience.iop.org
Atom interferometers have been developed in the last three decades as new powerful tools
to investigate gravity. They were used for measuring the gravity acceleration, the gravity …
to investigate gravity. They were used for measuring the gravity acceleration, the gravity …
Nuclear clocks for testing fundamental physics
The low-energy, long-lived isomer in 229 Th, first studied in the 1970s as an exotic feature in
nuclear physics, continues to inspire a multidisciplinary community of physicists. It has …
nuclear physics, continues to inspire a multidisciplinary community of physicists. It has …
Search for topological defect dark matter with a global network of optical magnetometers
Ultralight bosons such as axion-like particles are viable candidates for dark matter. They can
form stable, macroscopic field configurations in the form of topological defects that could …
form stable, macroscopic field configurations in the form of topological defects that could …