Excited-Band Coherent Delocalization for Improved Optical Lattice Clock Performance
arxiv(2024)
摘要
We implement coherent delocalization as a tool for improving the two primary
metrics of atomic clock performance: systematic uncertainty and instability. By
decreasing atomic density with coherent delocalization, we suppress
cold-collision shifts and two-body losses. Atom loss attributed to Landau-Zener
tunneling in the ground lattice band would compromise coherent delocalization
at low trap depths for our 171Yb atoms; hence, we implement
for the first time delocalization in excited lattice bands. Doing so increases
the spatial distribution of atoms trapped in the vertically-oriented optical
lattice by ∼7 times. At the same time we observe a reduction of the
cold-collision shift by 6.5(8) times, while also making inelastic two-body loss
negligible. With these advantages, we measure the trap-light-induced quenching
rate and natural lifetime of the ^3P_0 excited-state as
5.7(7)×10^-4 E_r-1s-1 and
19(2) s, respectively.
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