A four-ion indium Coulomb-crystal clock operates with 1.7 times lower instability than a single ion, and a model of spontaneous-decay dead time explains the observed scaling.
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High-accuracy multi-ion spectroscopy with mixed-species Coulomb crystals
A four-ion indium Coulomb-crystal clock operates with 1.7 times lower instability than a single ion, and a model of spontaneous-decay dead time explains the observed scaling.