there’s a table of candidate optical standards, ranging from 0.4 to 1.1 THz, using Hg or Al or Yb or Sr or Ca, in trapped ion optical clocks or neutral atom optical lattice clocks
it says 4 labs have Yb lattices and 3 have Sr lattices in production contributing to TAI
then one lab using oldskool rubidium, i’m pretty sure that’s the USNO’s rubidium fountains, which are unusual in (a) using rubidium instead of caesium and (b) operating continuously rather than for calibrating other clocks
Tony Finch /
npub1qw…sxm8d
2024-03-21 22:25:59
in reply to nevent1q…n7yw
Author Public Key
npub1qw6vqcz3kc7d6ccfegyw3azkj805rzrvugrdqxxp0waampp74fdsjsxm8dPublished at
2024-03-21 22:25:59Event JSON
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