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Applied Physics B

Laser cooling of 171Yb+ ions in a linear paul trap

Peter Fisk, M.A. Lawn, C. Coles

Published Oct 1, 1993• 36 citations
Publisher
DOI
10.1007/bf00325208

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Coulomb crystals, containing up to a few hundred ions of which more than 50% were cooled sympathetically by the Coulomb interaction with laser cooled Mg+ ions, have been produced in a linear Paul trap. By controlling the balance of the radiation pressure from the two cooling lasers, the Coulomb crystals could be segregated according to ion species. Previous studies of ion crystals and molecular dynamics simulations suggest that the temperature may be around 10 mK or lower. The obtained results indicate that a wide range of atomic and molecular ions, which due to their internal structures are not amenable to direct laser cooling, can be effectively cooled and localized (crystallized) in linear Paul traps. For high resolution spectroscopy of such ions this may turn out to be very useful.
Deterministic ion implantation and color-center creation methods at the nanometer scale provide a route towards scalable quantum information processing. For this purpose, we have developed an inherently deterministic single-ion implantation method based on a linear Paul trap (LPT) as a single-ion source since the laser-cooling technique can be applied to the trap system to obtain ultralow-emittance ions and manipulate single ions one by one . Doubly charged nitrogen ions (N2+) produced in a sputter ion source is introduced into the LPT and sympathetically cooled with laser-cooled calcium ions (Ca+). Both the sputter ion source and the LPT chamber are elevated to +50kV for the 100keV-implantation of doubly charged single ions into a grounded diamond crystal.