Entanglement in Resonance Fluorescence

• URL: http://arxiv.org/abs/2302.04059v2
• Date: Fri, 16 Jun 2023 11:01:23 GMT
• Title: Entanglement in Resonance Fluorescence
• Authors: Juan Camilo L\'opez Carre\~no, Santiago Berm\'udez Feijoo and Magdalena Stobi\'nska
• Abstract summary: We introduce a new source of entangled photons based on resonance fluorescence delivering photon pairs as a superposition of vacuum. The degree of entanglement can be optimized for every pair of frequencies, thus demonstrating a clear advantage over existing technologies.
• Score: 0.0
• License: http://creativecommons.org/licenses/by/4.0/
• Abstract: Particle entanglement is a fundamental resource upon which are based many quantum technologies. However, the up-to-now best sources of entangled photons rely on parametric down-conversion processes, which are optimal only at certain frequencies, which rarely match the energies of condensed-matter systems that can benefit from entanglement. In this Article, we show a way to circumvent this issue, and we introduce a new source of entangled photons based on resonance fluorescence delivering photon pairs as a superposition of vacuum and the Bell state $|\Phi^-\rangle$. Our proposal relies on the emission from the satellite peaks of a two-level system driven by a strong off-resonant laser, whose intensity controls the frequencies of the entangled photons. Furthermore, the degree of entanglement can be optimized for every pair of frequencies, thus demonstrating a clear advantage over existing technologies. Finally, we illustrate the power of our novel source of entangled single-photon pairs by exciting a system of polaritons and showing that they are left in a maximally entangled steady state.

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