Work

International System of Units-traceable temperature calibration based on optical lattice clocks

Year: 2025

Type: article

Abstract: We present an International System of Units (SI)-traceable temperature calibration apparatus utilizing optical lattice clocks for precision metrology. The system employs a dual-blackbody radiation shield chamber with independent temperature control, enabling synchronous differential measurements of blackbody radiation (BBR)-induced frequency shifts in atomic ensembles. By correlating these shifts with chamber temperature, we propose absolute temperature determination traceable to the SI second through the optical clock frequency. Comprehensive uncertainty analysis demonstrates an absolute temperature uncertainty below 17 mK across the 200 − 350 K range based on Sr 87 optical lattice clock, representing an improvement of two orders of magnitude over current temperature measurements based on BBR-induced Rydberg state transitions. This advancement in primary thermometry offers significant improvements in precision, reproducibility, and versatility, with potential applications in metrology, fundamental physics, and industrial processes.

Source: Physical Review Research

DOI: 10.1103/4xmq-pfyv

Authors: Jin Cao, Benquan Lu, Xiaotong Lu, Hong Chang

Institutions: National Time Service Center, University of Chinese Academy of Sciences

Language: English

Topic: Advanced Frequency and Time Standards

Subfield: Atomic and Molecular Physics, and Optics

Field: Physics and Astronomy

Domain: Physical Sciences

Open Access status: gold

Estimated APC paid: $2,625

Funders: National Natural Science Foundation of China, Chinese Academy of Sciences