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Trapping, Shaping and Isolating of Ion Coulomb Crystals via State-selective Optical Potentials by Weckesser, Pascal; Thielemann, Fabian; Hoenig, Daniel; Lambrecht, Alexander; Karpa, Leon; Schaetz, Tobias is a scholarly article available to read on EtoBox.

What is Trapping, Shaping and Isolating of Ion Coulomb Crystals via State-selective Optical Potentials about?

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 $6\mathrm{S}_{\mathrm{1/2}}$ electronic ground or the $5\mathrm{D}_{\mathrm{3/2}}$/ $5\mathrm{D}_{\mathrm{5/2}}$ 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.

Author

Weckesser, Pascal; Thielemann, Fabian; Hoenig, Daniel; Lambrecht, Alexander; Karpa, Leon; Schaetz, Tobias

Published

2020

Language

EN