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| Home > Publications database > Analyzing the collective emission of a Rydberg-blockaded single-photon source based on an ensemble of thermal atoms |
| Journal Article | FZJ-2026-02304 |
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2024
Inst.
Woodbury, NY
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Please use a persistent id in citations: doi:10.1103/PhysRevA.109.013705
Abstract: An ensemble of rubidium atoms can be excited with lasers such that it evolves into an entangled state with justone collective excitation within the Rydberg-blockade radius. The decay of this state leads to the emission of asingle antibunched photon. For a hot vapor of rubidium atoms in a microcell, we numerically study the feasibilityof such a single-photon source under different experimental conditions like the atomic density distribution andthe choice of electronic states addressed by the lasers. For the excitation process with three rectangular laserspulses, we simulate the coherent dynamics of the system in a truncated Hilbert space. We investigate the radiativebehavior of the moving rubidium atoms and optimize the laser pulse sequence accordingly. We find that thecollective decay of the single excitation leads to a fast and directed photon emission and further that a pulsesequence similar to a spin echo increases the directionality of the photon. Finally, we analyze the residual doubleexcitations and find that they do not exhibit these collective decay properties and play only a minor deleteriousrole.
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