Collective early-time spontaneous decay of a strongly driven cold atomic ensemble

• URL: http://arxiv.org/abs/2511.17187v1
• Date: Fri, 21 Nov 2025 12:07:38 GMT
• Title: Collective early-time spontaneous decay of a strongly driven cold atomic ensemble
• Authors: Daniel Benedicto Orenes, Naudson Lucas Lopes Matias, Apoorva Apoorva, Antoine Glicenstein, Raphaël Saint-Jalm, Robin Kaiser,
• Abstract summary: We investigate the collective early-time decay rates of a strongly driven and optically dense cold atomic cloud.<n>We find that as a function of the driving frequency, the behavior of the collected light at certain angles transitions from the single-photon subradiant regime to a superradiant regime.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: In this work we present a numerical and experimental investigation of the collective early-time decay rates of a strongly driven and optically dense cold atomic cloud. We prepare the atomic ensemble by driving the system to its steady state with varying Rabi frequencies $Ω$ that go from the weak $Ω\ll Γ$ to the strong driving regime $Ω\gg Γ$, where $Γ$ is the single-atom decay rate. We investigate the early-time dynamics in the transition between the strong and weak driving regimes using: i) angular-dependent observables such as the light emitted by the cloud, and ii) global observables, i.e., the excited state population. When driving the cloud on-resonance, we find that as a function of the driving frequency, the behavior of the collected light at certain angles transitions from the single-photon subradiant regime to a superradiant regime while the behavior of the excited state population does not show superradiance. The experiment shows good agreement with numerical predictions in the regime of parameters under study.

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