standard

SI second

The base unit of time in the International System of Units, defined since 1967 by a hyperfine transition in caesium-133 and under international review for redefinition on an optical transition.

Known aliases

SI unit of time
the second

Relationships

No evidence-backed relationships are recorded.

Current clusters

science1 publisher

A lutetium ion clock in Singapore reports the lowest uncertainty yet for an optical clock

Murray Barrett's group at Singapore's Centre for Quantum Technologies spent more than a decade on an element no other timekeeping lab uses, and now reports one part in 10^19 for a single lutetium ion clock. A redefinition of the second is expected in or after 2030.

Publishers:phys.org

Reality

Evidence62
Adoption10
Hype gap+24
Incentives58
Confidence55

science1 publisher

Two lutetium ion clocks agree at 5.7 parts in 10^19 after 200 hours of averaging

Each 176Lu+ reference has an evaluated systematic uncertainty near 1 x 10^-19, and the direct comparison between them resolves any difference only to 5.7 x 10^-19, six times coarser than the budget under test.

Publishers:nature.com

Reality

Evidence72
Adoption15
Hype gap+12
Incentives62
Confidence68