Chip-based integrated optical frequency combs highly stable, furthering compact, low-power, portable atomic clocks

https://phys.org/news/2026-10-chip-based-frequency-potential-portable.html

"chip-based microresonator frequency comb capable of generating ultra-stable optical references in a compact, microchip-scale footprint integrates nonlinear photonic waveguide architectures onto a silicon platform... replaces traditional, bulky benchtop laser setups without sacrificing precise frequency spacing... satellites, defense, mobile navigation units in GPS-denied environments, quantum sensing"

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The first stand-alone nuclear clock is ticking in Vienna
https://www.eurekalert.org/news-releases/1146221

Tsinghua team achieves breakthrough in nuclear clock technology
https://www.phys.tsinghua.edu.cn/phyen/info/1154/2344.htm