Kavli Affiliate: Xiang Zhang
| First 5 Authors: Zhi-Peng Jia, Zhi-Peng Jia, , ,
| Summary:
We report a systematic uncertainty of $9.2times 10^-19$ for the USTC Sr1
optical lattice clock, achieving accuracy at the level required for the roadmap
of the redefinition of the SI second. A finite-element model with it in
situ-validated, spatially-resolved chamber emissivity reduced blackbody
radiation shift uncertainty to $6.3times 10^-19$. Concurrently, an
externally mounted lattice cavity combined with a larger beam waist suppressed
density shifts. Enhanced lattice depth modulation consolidated lattice light
shift uncertainty to $6.3times 10^-19$ by enabling simultaneous
determination of key polarizabilities and magic wavelength. Magnetic shifts
were resolved below $10^-18$ via precision characterization of the
second-order Zeeman coefficient. Supported by a crystalline-coated
ultra-low-expansion cavity-stabilized laser and refined temperature control
suppressing BBR fluctuations, the clock also achieves a frequency stability
better than $1times10^-18$ at 30,000-s averaging time. These developments
collectively establish a new benchmark in USTC Sr1 clock performance and pave
the way for high-accuracy applications in metrology and fundamental physics.
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