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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster – Quantum Technologies I

Q 29.30: Poster

Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG

Role of time delay in two-color excitation protocols — •Zahra Noorinejad, Thomas Bracht, Doris Reiter, and Moritz Cygorek — Condensed Matter Theory, Department of Physics, TU Dortmund, Dortmund 44221, Germany

Fast excitation of a quantum dot (QD) on the order ofpicoseconds is one of the most important ingredients in quantum optics and quantum photonics. It has been suggested to use two-color excitation to achieve population inversion, for example in Nature Physics, volume 15, 941*946 (2019) by Y. He et al., and in Phys. Rev. Lett. 126, 047403 (2021) by Z. X. Koong et al. We resolve the apparent contradiction between these two papers and attribute it to the role of the time delay between the pulses. By several examples, we show that by controlling the time delay, one can tune the resonant Rabi oscillation and thereby obtain complete population inversion. Finally, we calculate the effect of phonons on our results.

Keywords: Quantum Dot; two-color excitation; Fast excitation; phonon