Trapping, Shaping and Isolating of Ion Coulomb Crystals via State-selective Optical Potentials

Abstract

For conventional ion traps, the trapping potential is close to independent of the electronic state, providing confinement for ions dependent primarily on their charge-to-mass ratio $Q/m$. In contrast, storing ions within an optical dipole trap results in state-dependent confinement. Here we experimentally study optical dipole potentials for ${}^{138}{\mathrm{Ba}}^{+}$ ions stored within two distinctive traps operating at 532 nm and 1064 nm. We prepare the ions in either the $6{\mathrm{S}}_{1/2}$ electronic ground or the $5{\mathrm{D}}_{3/2}$/ $5{\mathrm{D}}_{5/2}$ metastable excited state and probe the relative strength and polarity of the potential. On the one hand, we apply our findings to selectively remove ions from a Coulomb crystal, despite all ions sharing the same $Q/m$. On the other hand, we deterministically purify the trapping volume from parasitic ions in higher-energy orbits, resulting in reliable isolation of Coulomb crystals down to a single ion within a radio-frequency trap.

arXiv comment9 pages, 5 figures

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• Ultracold ion-atom experiments: cooling, chemistry, and quantum effects
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• Tune-out wavelength for the thulium atom near 576 nm