Abstract The Gravity Recovery and Climate Experiment (GRACE) has demonstrated that low–
low satellite-to-satellite tracking enables monitoring the time variations of the Earth's gravity …

Quantum physics challenges our understanding of the nature of physical reality and of
space-time and suggests the necessity of radical revisions of their underlying concepts …

With the demonstration of quantum-limited optical time transfer capable of tolerating the
losses associated with long ground-to-space links, two future applications of free-space time …

Abstract The Drag-Free and Attitude Control System (DFACS) is a critical platform for various
space missions, including high precision satellite navigation, geoscience and gravity field …

We present a compact and robust transportable ultra-stable laser system with minimum
fractional frequency instability of 1× 10− 15 at integration times between 1 and 10 s. The …

BOOST (BOOst Symmetry Test) is a proposed space mission to search for Lorentz
invariance violations and aims to improve the Kennedy-Thorndike parameter constraint by …

Low-frequency high-precision laser interferometry is subject to excess laser-frequency-noise
coupling via arm-length differences which is commonly mitigated by locking the frequency to …

The measurement of the static and temporal variation of Earth's gravity field yields important
information on water storage, seasonal and sub-seasonal water cycles, their impact on …

We experimentally demonstrate an inter-satellite laser link acquisition scheme for GRACE
Follow-On. In this strategy, dedicated acquisition sensors are not required—instead we use …

We describe a prototype optical cavity and associated optics that has been developed to
provide a stable frequency reference for a future space-based laser ranging system. This …