Prospect for Precision Measurement of the Yb²⁺ ¹S₀-³P₀[o] Transition Frequency

Chr. Tamm, T. Schneider, E. Peik

Naoki Kimura, Masatoshi Kajita

We discuss prospects of precision measurement of the Yb2+ 4f14 1S0–4f13 5d \(^{3}\text{P}_{0}^{o}\) transition frequency (1.4 × 1015 Hz). Attainable uncertainty of this precision measurement is theoretically estimated. This transition is free from the electric quadrupole shift, and this specific property allows for precision spectroscopy using a multi-ion string Coulomb crystal and contributes to reduction of the statistical uncertainty. A systematic uncertainty of the order 10−18 is attainable because the Stark and Zeeman shifts are small due to the intrinsic level structure of multiply charged ions. This clock transition can be monitored without quantum logical methods by observing the laser-induced fluorescence from the 1S0–\(^{3}\text{P}_{1}^{o}\) transition with a closed optical cycle.

Xiaohu Fu, Su Fang, Ru-Chen Zhao +5 more

We report on the observation of the highly forbidden 1S0–3P0 optical clock transition in laser-cooled 199Hg atoms. More than 95% depletion of cold 199Hg atoms is detected in the magneto-optical trap. Using the free-of-field detection method, the AC Stark shift from the cooling laser is removed from the in-field spectroscopy. At low-power clock laser pumping, the linewidth of the clock spectroscopy is approximately 450 kHz (full width at half-maximum), which corresponds to a Doppler broadening at the atom temperature of 60 μK. We determine the 1S0–3P0 transition frequency to be 1,128,575,290.819(14) MHz by referencing with a hydrogen maser and measuring with a fiber optical frequency comb. Moreover, a weak Doppler-free signal is observed.

Claire E. Cramer, Tao Hong, Warren Nagourney +1 more

Y. H. Wang, Rainer Dumke, Tao Liu +7 more

Ilia V. Zalivako, Ilya A. Semerikov, Alexander S. Borisenko +6 more