Sub-Doppler cooling of trapped ions using optical tweezers

Abstract

We propose a sub-Doppler cooling scheme for trapped-ion crystals in Paul traps. The combination of a hollow tweezer and microwave drive creates an effective two-level system which is cooled through attractive Sisyphus cooling. For ¹⁷¹Yb⁺ ions, we numerically identify optimal parameters for one- and two-ion crystals, and investigate the cooling rate in ion crystals with up to three ions. Our cooling scheme utilizes a single ion addressed with a tweezer to achieve sub-Doppler cooling of the N axial motional modes perpendicular to the tweezer propagation direction, does not rely on the Lamb-Dicke regime and uses off-resonant light. We reach 1/e cooling times for the center of mass mode of τ_com<2 ms, and a steady-state excitation number of n̅_com≈ 0.7. Our scheme is well-suited as an intermediate stage between Doppler cooling and ground-state sideband cooling, and can be readily realized in trapped-ion platforms.

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BibTeX RIS

BibTeX

@misc{gerritsen2026subdoppler,
  title = {{Sub-Doppler cooling of trapped ions using optical tweezers}},
  author = {Bas Gerritsen and Liam J. Bond and Jiri Minář and Arghavan Safavi-Naini and Robert J. Spreeuw and Rene Gerritsma},
  howpublished = {arXiv},
  year = {2026},
  month = sep,
  doi = {10.48550/arxiv.2609.28138},
  eprint = {2609.28138},
  archivePrefix = {arXiv},
  url = {https://arxiv.org/abs/2609.28138},
}

RIS

TY  - UNPB
TI  - Sub-Doppler cooling of trapped ions using optical tweezers
AU  - Bas Gerritsen
AU  - Liam J. Bond
AU  - Jiri Minář
AU  - Arghavan Safavi-Naini
AU  - Robert J. Spreeuw
AU  - Rene Gerritsma
PY  - 2026
DA  - 2026/09/23
PB  - arXiv
DO  - 10.48550/arxiv.2609.28138
UR  - https://arxiv.org/abs/2609.28138
AB  - We propose a sub-Doppler cooling scheme for trapped-ion crystals in Paul traps. The combination of a hollow tweezer and microwave drive creates an effective two-level system which is cooled through attractive Sisyphus cooling. For ^171Yb^+ ions, we numerically identify optimal parameters for one- and two-ion crystals, and investigate the cooling rate in ion crystals with up to three ions. Our cooling scheme utilizes a single ion addressed with a tweezer to achieve sub-Doppler cooling of the N axial motional modes perpendicular to the tweezer propagation direction, does not rely on the Lamb-Dicke regime and uses off-resonant light. We reach 1/e cooling times for the center of mass mode of τ_com<2 ms, and a steady-state excitation number of n̅_com≈ 0.7. Our scheme is well-suited as an intermediate stage between Doppler cooling and ground-state sideband cooling, and can be readily realized in trapped-ion platforms.
ER  -

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