A shallow-lattice 87Sr clock reaches roughly 118 s coherence time and 1.5e-18 fractional instability at 1 s, with decoherence traced to Raman scattering and spectator-atom collisions.
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Atomic Coherence of 2 minutes and Instability of 1.5E-18 at 1 s in a Wannier-Stark Lattice Clock
A shallow-lattice 87Sr clock reaches roughly 118 s coherence time and 1.5e-18 fractional instability at 1 s, with decoherence traced to Raman scattering and spectator-atom collisions.