Atomic Coherence of 2 Minutes and Instability of 1.5 x 10^-18 at 1 s in a Wannier-Stark Lattice Clock

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We explore the limits of atomic coherence and measurement precision in a 87Sr optical lattice clock. We
perform a detailed characterization of key effects, including lattice Raman scattering and atomic collisions
in a shallow lattice configuration, determining a 174(28) s 3P0 clock state lifetime. Investigation of atomic
coherence across a range of lattice depths and atomic densities reveals decoherence mechanisms related to
photon scattering and atomic interaction. At a reduced density, we observe a coherence time of 118(9) s,

Year of Publication
2025
Date Published
2025-07
Journal Title
Physical Review Letters
Volume
135
Issue
10
Start Page or Article ID
103601
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Atomic coherence of 2 minutes