Uwe Sterr

TL;DR: In this article, a single-crystal silicon system that offers a fractional frequency instability of 1 × 10−16 at short timescales and supports a laser linewidth of less than 40 mHz at 1.5 µm is presented.

TL;DR: The capability of performing high resolution international clock comparisons paves the way for a redefinition of the unit of time and an all-optical dissemination of the SI-second.

TL;DR: The first field measurement campaign with a transportable optical lattice clock was reported in this article, where the authors used it to determine the gravity potential difference between the middle of a mountain and a location 90 km away.

TL;DR: Two ultrastable lasers stabilized to single-crystal silicon Fabry-Pérot cavities at 124 K show unprecedented thermal noise-limited frequency instabilities of 4×10 and linewidths below 10 mHz.

TL;DR: In this paper, a new class of ultrastable laser based on cryogenic silicon reference cavities has recently demonstrated the longest optical coherence times to date, and the authors utilized such a local oscillator with two strontium optical lattice clocks to achieve an advance in clock stability.