Freiburg 2019 – wissenschaftliches Programm

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FM: Fall Meeting

FM 76: Entanglement: Spectroscopy

FM 76.3: Talk

Donnerstag, 26. September 2019, 14:45–15:00, 1015

Quantum Logic Spectroscopy of Highly Charged Ions — •Lukas J. Spieß1, Steven A. King1, Peter Micke1, Tobias Leopold1, Erik Benkler1, José R. Crespo López-Urrutia2, and Piet O. Schmidt1,31Physikalisch-Technische Bundesanstalt, Braunschweig — 2Max-Planck Institut für Kernphysik, Heidelberg — 3Institut für Quantenoptik, Leibniz Universität Hannover

Highly charged ions (HCI) offer extreme properties, making them suitable candidates for the search for physics beyond the standard model or novel optical clocks [1]. Production and storage of HCI commonly occurs at MK temperatures, limiting the spectroscopic resolution to the hundreds of MHz scale. This has been overcome by sympathetically cooling HCI in a linear Paul trap using Be+ ions [2].

Ar13+ ions are produced in an electron beam ion trap, from where they are extracted, transported to and injected into a Paul trap. A Be+-Ar13+ two-ion crystal is prepared and cooled to its motional ground state. Spectroscopy on the 2P1/2 to 2P3/2 transition in the Ar13+ ion at 441 nm is performed using the quantum logic technique [3]. There, the internal state of the Ar13+ ion after laser excitation is transferred to the Be+ ion through their shared motional mode for readout. The achieved sub Hz resolution gives insight into relativistic, interelectronic and QED contributions to the excited state g-factor. The first optical clock based on a HCI is also demonstrated.

[1] M. G. Kozlov et al., Rev. Mod. Phys. 90, 045005 (2018)

[2] L. Schmöger et al., Science 347 1233-1236 (2015)

[3] P. O. Schmidt et al., Science 309 749 (2005)

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