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Q: Fachverband Quantenoptik und Photonik

Q 29: Poster – Quantum Technologies I

Q 29.35: Poster

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

Theory of Quantum Dot Photon Properties: Influence of Hot States and Phonons — •Jana Schlücking¹, Maximilian Aigner², Thomas Bracht¹, Eva Schöll², Armando Rastelli², and Doris Reiter¹ — ¹TU Dortmund University, 44221 Dortmund, Germany — ²JKU Linz, Altenberger Straße 69, 4040 Linz, Austria

Semiconductor quantum dots are promising single-photon sources for quantum communication technologies. The generation of indistinguishable photons is essential for these applications, yet it is strongly affected by various decoherence mechanisms. In this work, we investigate how the interaction of a quantum dot and its solid-state environment affects photon indistinguishability as a function of temperature.

We start to model the quantum dot as a two-level system and account for its coupling to a non-Markovian phonon environment. The model is then extendend to include higher excited, so called hot states, which are connected to the excited state through temperature-dependent transitions. At low temperatures, the loss of coherence is mainly caused by pure dephasing processes, while at higher temperatures the decrease of the indistinguishability is dominated by the hot states dynamics.

Our results show excellent agreement between measurement and simulation, which demonstrates that the inclusion of such hot states is crucial to explain the temperature dependence of photon indistinguishability. These insights help to clarify the limitations of often assumed two-level system dynamics and offer guidance for optimizing quantum dots as applicable single photon sources.

Keywords: Single Photon Indistinguishability; Quantum Dot; Electron-Phonon Interaction