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HL: Fachverband Halbleiterphysik
HL 19: Quantum Dots and Wires: Optics I
HL 19.6: Vortrag
Dienstag, 19. März 2024, 10:45–11:00, EW 202
Entanglement in Resonance Fluorescence — •Santiago Bermúdez Feijóo1, Juan Camilo Lopez Carreño2, and Magdalena Stobinska3 — 1Departamento de Fisica, Universidad Nacional de Colombia, Ciudad Universitaria, K. 45 No. 26 85, Bogota D.C., Colombia — 2Institute of Theoretical Physics, University of Warsaw, ul. Pasteura 5, 02-093, Warsaw, Poland — 3Faculty of Mathematics, Informatics and Mechanics, University of Warsaw, ul. Banacha 2, 02-097 Warsaw, Poland
Particle entanglement is a fundamental resource upon which are based many quantum technologies. In this Article, we introduce a new source of entangled photons based on resonance fluorescence delivering photon pairs as a superposition of vacuum and the Bell state |Φ−⟩. 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. Notably, the frequency of the entangled photons can be tuned without decreasing their degree of entanglement and, unlike current technologies, the intensity of our source can be increased without the risk of spoiling the signal by involving high-order processes into the emission. Finally, we illustrate the power of our novel source by exciting an ubiquitous condensed-matter system, namely polaritons, and showing that they are left in a maximally entangled steady state.
Keywords: Resonance fluorescence; Entangled photons; Bell state; Two level system; Polaritons