Optical response of a binary atomic system with incoherent gain
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| Format: | Preprint |
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2025
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| _version_ | 1866918071141138432 |
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| author | Acevedo, L. Sánchez-Cánovas, J. Donaire, M. |
| author_facet | Acevedo, L. Sánchez-Cánovas, J. Donaire, M. |
| contents | We study the optical response of a binary system of identical atoms in which one of them is excited by an incoherent pump. %We study the properties of photon scattering, absorption and emission, together with the time evolution of the atomic system. %This allows us to characterize and eventually manipulate the state of the system, paving the way for prospective applications in quantum information processing. Applying the diagrammatic formalism developed in Donaire [Phys. Rev. A104, 043704 (2021)], it is shown how scattering, absorption, stimulated emission, spontaneous emission and resonant energy transfer can be tailored by varying i) the interatomic distance, which governs the interference effects of the emitted radiation; and ii) the pump rate, which determines the population of the atomic levels. It is found that, for sufficiently strong pumping, the collective component of the extinction cross-section becomes negligible, regardless of the interatomic distance, as optical gains compensate for losses, and the total extinction cross-section is reduced to less than half of its value in the absence of pumping. In contrast, at weak pumping and short interatomic distances, interference effects lead to a significant suppression of the extinction cross-section relative to that of two noninteracting atoms. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2506_21177 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Optical response of a binary atomic system with incoherent gain Acevedo, L. Sánchez-Cánovas, J. Donaire, M. Quantum Physics We study the optical response of a binary system of identical atoms in which one of them is excited by an incoherent pump. %We study the properties of photon scattering, absorption and emission, together with the time evolution of the atomic system. %This allows us to characterize and eventually manipulate the state of the system, paving the way for prospective applications in quantum information processing. Applying the diagrammatic formalism developed in Donaire [Phys. Rev. A104, 043704 (2021)], it is shown how scattering, absorption, stimulated emission, spontaneous emission and resonant energy transfer can be tailored by varying i) the interatomic distance, which governs the interference effects of the emitted radiation; and ii) the pump rate, which determines the population of the atomic levels. It is found that, for sufficiently strong pumping, the collective component of the extinction cross-section becomes negligible, regardless of the interatomic distance, as optical gains compensate for losses, and the total extinction cross-section is reduced to less than half of its value in the absence of pumping. In contrast, at weak pumping and short interatomic distances, interference effects lead to a significant suppression of the extinction cross-section relative to that of two noninteracting atoms. |
| title | Optical response of a binary atomic system with incoherent gain |
| topic | Quantum Physics |
| url | https://arxiv.org/abs/2506.21177 |