Tag: #opticalclocks

PTB reports interspecies optical‑clock comparison below 5×10⁻¹⁸ using transportable clock

PTB reports a transportable strontium lattice clock matched a stationary ytterbium‑ion clock to 4.3×10⁻¹⁸ uncertainty; result is a preprint.

#physics, #opticalclocks, #metrology, #ptb

Boulder team reports optical clock comparisons hitting 3.2×10⁻¹⁸ uncertainty, a milestone toward redefining the second

Researchers in Boulder compared three optical atomic clocks with uncertainties down to 3.2×10⁻¹⁸, meeting a benchmark for redefining the SI second.

#opticalclocks, #metrology, #timekeeping, #atomicphysics