Collective early-time spontaneous decay of a cold atomic ensemble from the single to multiple excitation regime
Abstract
In this work, we present a numerical and experimental investigation of the collective early-time decay rates of an optically dense cold atomic cloud supporting a large number of excitations. We prepare the atomic ensemble by driving the system to its steady state with varying Rabi frequencies Ω that go from the low excitation Ω ≪ Γ to the multiple excitation regime Ω ≫ 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 (1) angular-dependent observables, such as the light emitted by the cloud, and (2) 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 at the chosen angle of observation in the regime of parameters under study.
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BibTeX
@article{orenes2026collective,
title = {{Collective early-time spontaneous decay of a cold atomic ensemble from the single to multiple excitation regime}},
author = {Daniel Benedicto Orenes and Naudson Lucas Lopes Matias and Apoorva Apoorva and Antoine Glicenstein and Raphaël Saint-Jalm and Robin Kaiser},
journal = {Physical Review Research},
year = {2026},
month = aug,
doi = {10.1103/kqr8-h1m5},
url = {https://hal.science/hal-05760592v1},
note = {CC BY},
}
RIS
TY - JOUR
TI - Collective early-time spontaneous decay of a cold atomic ensemble from the single to multiple excitation regime
AU - Daniel Benedicto Orenes
AU - Naudson Lucas Lopes Matias
AU - Apoorva Apoorva
AU - Antoine Glicenstein
AU - Raphaël Saint-Jalm
AU - Robin Kaiser
PY - 2026
DA - 2026/08/18
JO - Physical Review Research
DO - 10.1103/kqr8-h1m5
UR - https://hal.science/hal-05760592v1
AB - In this work, we present a numerical and experimental investigation of the collective early-time decay rates of an optically dense cold atomic cloud supporting a large number of excitations. We prepare the atomic ensemble by driving the system to its steady state with varying Rabi frequencies Ω that go from the low excitation Ω ≪ Γ to the multiple excitation regime Ω ≫ 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 (1) angular-dependent observables, such as the light emitted by the cloud, and (2) 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 at the chosen angle of observation in the regime of parameters under study.
SN - 2643-1564
SN - 2643-1564
ER -