Bonn 2025 – wissenschaftliches Programm

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A: Fachverband Atomphysik

A 37: Poster – Highly Charged Ions and their Applications

A 37.7: Poster

Donnerstag, 13. März 2025, 17:00–19:00, Tent

Towards ground state cooling of mixed ion crystals in the intermediate Lamb-Dicke regime. — •Devanarayanan Rajeeb Kumar, Elwin A. Dijck, Stepan Kokh, Vera M. Schäfer, Christian Warnecke, José R. Crespo López-Urrutia, and Thomas Pfeifer — Max-Planck-Institut für Kernphysik, Heidelberg

Precision measurements are one of the approaches in the search for new physics. Using highly charged ions (HCIs) offers reduced systematic effects and an increased number of available transitions for generalized King plot analyses [1]. Implementing quantum logic spectroscopy [2] of an HCI co-trapped with a Be⁺ ion for cooling and state readout requires ground-state cooling of the axial motional modes. Building upon our ground-state cooling of a single beryllium ion by pulsed sideband cooling including excitation of higher order sidebands, we report on our progress in achieving ground-state cooling of axial modes of mixed-species crystals, although our current trap operates only in an intermediate Lamb-Dicke regime with η as large as 0.8 for certain modes.

[1] Rehbehn et al., Phys. Rev. Lett. 131, 161803 (2023)

[2] Schmidt et al., Science 309, 749 (2005)

Keywords: Ground State Cooling; Ion Crystals; Quantum Logic Spectroscopy