This is linked in the article but easy to miss, it has helpful visualizations of the “time programmable frequency comb”: https://www.nist.gov/news-events/news/2

This is linked in the article but easy to miss, it has helpful visualizations of the “time programmable frequency comb”: https://www.nist.gov/news-events/news/2022/10/break-new-ground-frequency-combs-nist-innovation-plays-beat https://www.nist.gov/news-events/news/2022/10/break-new-grou... Some notable numbers from the paper: > the researchers’ time programmable frequency comb is capable of operating at this quantum limit, where fewer than one photon in a billion reaches its target device. It worked even when the laser was sending out only 40 microwatts of power, or about 30 times less than a laser pointer uses. > the pulse time and phase are digitally controlled with ±2-attosecond accuracy > Over 300 km between mountaintops in Hawaii with launched powers as low as 40 μW, distant timescales are synchronized to 320 attoseconds > at 4.0 mW transmit power, this approach can support 102 dB link loss, more than sufficient for future time transfer to geosynchronous orbits