Atomic clocks are vital in a wide array of technologies and experiments, including tests of
fundamental physics. Clocks operating at optical frequencies have now demonstrated …

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 …

Quantum sensors are used for precision timekee**, field sensing and quantum
communication,–. Comparisons among a distributed network of these sensors are capable …

Abstract Space-based research can provide a major leap forward in the study of key open
questions in the fundamental physics domain. They include the validity of Einstein's …

Ultracold atoms and ions provide novel test-beds for quantum sensing and metrology.
Technological advancement towards the construction of ultrastable and narrow linewidth …

A global network of optical atomic clocks will enable unprecedented measurement precision
in fields including tests of fundamental physics, dark matter searches, geodesy, and …

Atomic clocks are vital in a wide array of technologies and experiments, including tests of
fundamental physics 1. Clocks operating at optical frequencies have now demonstrated …

Geopotential and orthometric height differences between distant points can be measured via
timescale comparisons between atomic clocks. Modern optical atomic clocks achieve …

We present a concept for a high-precision optical atomic clock (OAC) operating on an Earth-
orbiting space station. This pathfinder science mission will compare the space-based OAC …

Fundamental limits of fiber link are set by non-reciprocal effects that violate the hypothesis of
equality between forward and backward path. Non-reciprocal noise arises technically from …