Incoherent repumping scheme in the $^{88}$Sr$^{+}$ five-level manifold

Valentin Martimort; Sacha Guesne; Derwell Drapier; Vincent Tugaye; Lilay Gros-Desormeaux; Valentin Cambier; Albane Douillet; Luca Guidoni; Jean-Pierre Likforman

arXiv · 2512.08710

Incoherent repumping scheme in the $^{88}$Sr$^{+}$ five-level manifold

Valentin Martimort·Sacha Guesne·Derwell Drapier·Vincent Tugaye·Lilay Gros-Desormeaux·Valentin Cambier·Albane Douillet·Luca Guidoni·Jean-Pierre Likforman

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Abstract

Laser-cooled trapped ions are at the heart of modern quantum technologies and their cooling dynamics often deviate from the simplified two-level atom model. Doppler cooling of the $^{88}$Sr$^{+}$ ion involves several electronic levels and repumping channels that strongly influence fluorescence. In this work, we study a repumping scheme for the $^{88}$Sr$^{+}$ ion by combining precision single-ion spectroscopy with comprehensive numerical modeling based on optical Bloch equations including 18 Zeeman sublevels. We show that, although the observed fluorescence spectra retain a Lorentzian lineshape, their width and amplitude cannot be explained by a two-level atom description. Moreover, we find the optimal repumping conditions for maximizing the photon scattering rate.

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Valentin Martimort, Sacha Guesne, Derwell Drapier, Vincent Tugaye, Lilay Gros-Desormeaux, Valentin Cambier, Albane Douillet, Luca Guidoni, Jean-Pierre Likforman. 2025-12-09. Incoherent repumping scheme in the $^{88}$Sr$^{+}$ five-level manifold. https://arxiv.org/abs/2512.08710

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