Efficient sympathetic motional-ground-state cooling of a molecular ion

2015/01/31 by Yong Wan, Florian Gebert, Fabian Wolf +1
Computer Science · Physics and Astronomy · #Atomic and Subatomic Physics Research #Atomic physics #Coherent anti-Stokes Raman spectroscopy #Cold Atom Physics and Bose-Einstein Condensates #Ground state #Ion #Laser #Laser cooling #Materials science #Optics #Physics #Quantum Information and Cryptography #Quantum mechanics #Raman cooling #Raman spectroscopy #Resolved sideband cooling #Sideband #Spectroscopy #physics.atom-ph #quant-ph

paper · pdf · doi:10.1103/physreva.91.043425

published as Phys. Rev. A 91, 043425 (2015) · 11 pages, 11 figures

arxiv created 2015/03/30 · openalex publication_date 2015/04/30 · arxiv updated 2015/05/06 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Cold molecular ions are promising candidates in various fields ranging from precision spectroscopy and test of fundamental physics to ultracold chemistry. Control of internal and external degrees of freedom is a prerequisite for many of these applications. Motional-ground-state cooling represents the starting point for quantum logic-assisted internal state preparation, detection, and spectroscopy protocols. Robust and fast cooling is crucial to maximize the fraction of time available for the actual experiment. We optimize the cooling rate of ground-state cooling schemes for single ²⁵Mg⁺ ions and sympathetic ground-state cooling of ²⁴MgH⁺. In particular, we show that robust cooling is achieved by combining pulsed Raman sideband cooling with continuous quench cooling. Furthermore, we experimentally demonstrate an efficient strategy for ground-state cooling outside the Lamb-Dicke regime.

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