Cooperative Fluorescence from a Strongly Driven Dilute Cloud of Atoms

Abstract

We investigate cooperative fluorescence in a dilute cloud of strongly driven two-level emitters. Starting from the Heisenberg equations of motion, we compute the first-order scattering corrections to the saturation of the excited-state population and to the resonance-fluorescence spectrum, which both require going beyond the state-of-the-art linear-optics approach to describe collective phenomena. A dipole blockade is observed due to long range dipole-dipole coupling that vanishes at stronger driving fields. Furthermore, we compute the inelastic component of the light scattered by a cloud of many atoms and find that the Mollow triplet is affected by cooperativity. In a lobe around the forward direction, the inelastic Mollow triplet develops a spectral asymmetry, observable under experimental conditions.

5 pages, 3 figures, supplementary material available upon request

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• Photon Scattering from a System of Multi-Level Quantum Emitters. I. Formalism
• Dispersionless subradiant photon storage in one-dimensional emitter chains
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• Resonance fluorescence of two asymmetrically pumped and coupled two-level systems
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• Fate of the Mollow triplet in strongly-coupled atomic arrays
• Hybrid sub- and superradiant states in emitter arrays with quantized motion
• Mirror-assisted coherent backscattering from the Mollow sidebands
• Dipole-dipole interacting two-level emitters in a moderately intense laser field
• Dense dipole-dipole-coupled two-level systems in a thermal bath
• Quantifying the breakdown of the rotating-wave approximation in single-photon superradiance