Sympathetic Cooling in Trapped Ions with Spectral Selectivity via the Zeeman Shift
Abstract
High-fidelity quantum logic operations in trapped ions often require the ions' collective motion to be cooled to near the ground state. Since cooling the ions' motion typically involves dissipative processes such as spontaneous photon scattering, sympathetic cooling is used on select coolant ions between gate sequences to cool the ion chain without affecting the data qubits. Common implementations for coolant ions include different atomic species, different isotopes of the same species or individually addressable ions. Each of these approaches have challenges associated with them, which include increased hardware complexity, reduced efficiency of radial mode cooling and re-ordering events which add additional experimental overhead. We demonstrate a sympathetic cooling scheme leveraging internal metastable atomic levels accessible via a narrow quadrupole transition, utilizing the natural Zeeman shift and individually addressed Raman transitions, to achieve isolation of the non-coolant or ``data ions" from coolant ions. We demonstrate modest decoherence of the data ions due to cooling, while preserving the coherence requirements for high-fidelity gate operations.
Related
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BibTeX
@misc{ranawat2026sympathetic,
title = {{Sympathetic Cooling in Trapped Ions with Spectral Selectivity via the Zeeman Shift}},
author = {Kavyashree Ranawat and Jiyong Yu and Andrew Van Horn and Jacob Whitlow and Kenneth R Brown and Jungsang Kim},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2605.27577},
eprint = {2605.27577},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2605.27577},
}
RIS
TY - UNPB
TI - Sympathetic Cooling in Trapped Ions with Spectral Selectivity via the Zeeman Shift
AU - Kavyashree Ranawat
AU - Jiyong Yu
AU - Andrew Van Horn
AU - Jacob Whitlow
AU - Kenneth R Brown
AU - Jungsang Kim
PY - 2026
DA - 2026/10/14
PB - arXiv
DO - 10.48550/arxiv.2605.27577
UR - https://arxiv.org/abs/2605.27577
AB - High-fidelity quantum logic operations in trapped ions often require the ions' collective motion to be cooled to near the ground state. Since cooling the ions' motion typically involves dissipative processes such as spontaneous photon scattering, sympathetic cooling is used on select coolant ions between gate sequences to cool the ion chain without affecting the data qubits. Common implementations for coolant ions include different atomic species, different isotopes of the same species or individually addressable ions. Each of these approaches have challenges associated with them, which include increased hardware complexity, reduced efficiency of radial mode cooling and re-ordering events which add additional experimental overhead. We demonstrate a sympathetic cooling scheme leveraging internal metastable atomic levels accessible via a narrow quadrupole transition, utilizing the natural Zeeman shift and individually addressed Raman transitions, to achieve isolation of the non-coolant or ``data ions" from coolant ions. We demonstrate modest decoherence of the data ions due to cooling, while preserving the coherence requirements for high-fidelity gate operations.
ER -