https://www.chinadaily.com.cn/a/202604/23/WS69e9e854a310d6866eb452af.html
China mass-produces chip-scale atomic clock with ultra-high precision - Chinadaily.com.cn
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https://www.nist.gov/news-events/news/2025/04/new-atomic-fountain-clock-joins-elite-group-keeps-world-time
New Atomic Fountain Clock Joins Elite Group That Keeps the World on Time | NIST
May 20, 2025 - NIST scientists have published results establishing a new atomic clock, NIST-F4, as one of the world’s most accurate timekeepers.
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