Author:
Miklos Maya,Tso Yee Ming,Robinson John M.,Hur Joonseok,Thompson James K.,Ye Jun
Abstract
We perform a self-synchronous clock comparison between two spin-squeezed ensembles in a strontium optical lattice clock to directly measure 2.0(3) dB of metrological gain beyond quantum projection noise-limited operation, averaging down to the 10
−
17 level.