摘要
We report recent experimental progress toward a trapped ^(113)Cd+ion microwave frequency standard.With laser cooling,a large number of trapped cadmium ions are cooled to crystallization and the temperature of the ion crystal is measured to be 16±3 mK.The second order Doppler frequency shift,a main limiting factor of the atomic clock's performance,is estimated to be less than 1×10^(-16).
作者
WANG Shi-Guang
ZHANG Jian-Wei
MIAO Kai
WANG Zheng-Bo
WANG Li-Jun
王时光;张建伟;缪凯;王正博;王力军(Joint Institute for Measurement Science,Tsinghua University,Beijing 100084;Department of Physics,Tsinghua University,Beijing 100084;Department of Precision Instruments and Mechanology,Tsinghua University,Beijing 100084)
基金
Supported by the National Basic Research Program of China under Grant No 2010CB922901
Tsinghua University Scientific Research Initiative Program(No 20091081474).
