Coherent Optical Clock down-Conversion Realizing Microwaves with 1018 Absolute Stability

摘要

We generate 10-GHz microwaves, derived from independent Yb optical clocks, with 2.4×10¹⁸ absolute fractional frequency stability, no significant offset at the 10¹⁹ level, and femtosecond-precision transfer of the optical clock phase to the microwave domain.