Concerted efforts are underway to establish an infrastructure for a global quantum Internet to
realise a spectrum of quantum technologies. This will enable more precise sensors, secure …

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 redshift. As …

The MICROSCOPE mission was designed to test the weak equivalence principle (WEP),
stating the equality between the inertial and the gravitational masses, with a precision of 10 …

Advances in quantum technologies are giving rise to a revolution in the way fundamental
physics questions are explored at the empirical level. At the same time, they are the seeds …

The general theory of relativity predicts that a star passing close to a supermassive black
hole should exhibit a relativistic redshift. In this study, we used observations of the Galactic …

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 …

Transportable strontium optical lattice clocks are developed with a fractional uncertainty of
5.5× 10− 18 for applications outside laboratories. A single clock consists of a spectroscopy …

Recent advances in optical atomic clocks and optical time transfer have enabled new
possibilities in precision metrology for both tests of fundamental physics and timing …

We present a robust, transportable Ca+ optical clock, with a systematic uncertainty of 1.3×
10− 17 limited by the black-body radiation (BBR) field evaluation and an uptime rate of> …

Abstract The proposed mission “Space Atomic Gravity Explorer”(SAGE) has the scientific
objective to investigate gravitational waves, dark matter, and other fundamental aspects of …