Resolved-sideband cooling of a single $^9$Be$^+$ ion in a Penning trap

• URL: http://arxiv.org/abs/2310.18262v2
• Date: Sun, 12 Nov 2023 21:04:57 GMT
• Title: Resolved-sideband cooling of a single $^9$Be$^+$ ion in a Penning trap
• Authors: Juan M. Cornejo, Johannes Brombacher, Julia A. Coenders, Moritz von Boehn, Teresa Meiners, Malte Niemann, Stefan Ulmer, Christian Ospelkaus
• Abstract summary: Key ingredient is ground-state cooling of the particle's motion through resolved-sideband laser cooling. We demonstrate resolved-sideband laser cooling of the axial motion of a single $9$Be$+$ ion in a cryogenic 5 Tesla Penning trap system.
• Score: 0.0
• License: http://arxiv.org/licenses/nonexclusive-distrib/1.0/
• Abstract: Manipulating individual trapped ions at the single quantum level has become standard practice in radio-frequency ion traps, enabling applications from quantum information processing to precision metrology. The key ingredient is ground-state cooling of the particle's motion through resolved-sideband laser cooling. Ultra-high-presicion experiments using Penning ion traps will greatly benefit from the reduction of systematic errors offered by full motional control, with applications to atomic masses and $g$-factor measurements, determinations of fundamental constants or related tests of fundamental physics. In addition, it will allow to implement quantum logic spectroscopy, a technique that has enabled a new class of precision measurements in radio-frequency ion traps. Here we demonstrate resolved-sideband laser cooling of the axial motion of a single $^9$Be$^+$ ion in a cryogenic 5 Tesla Penning trap system using a two-photon stimulated-Raman process, reaching a mean phonon number of $\bar{n}_z = 0.10(4)$. This is a fundamental step in the implementation of quantum logic spectroscopy for matter-antimatter comparison tests in the baryonic sector of the Standard Model and a key step towards improved precision experiments in Penning traps operating at the quantum limit.

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