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Q: Fachverband Quantenoptik und Photonik
Q 29: Poster – Quantum Technologies I
Q 29.39: Poster
Dienstag, 3. März 2026, 17:00–19:00, Philo 2. OG
Towards achieving Stirling Cooler operable Single Photon Sources — •Maximilian Aigner1, Christian Weidinger1, Eva Schöll1, Armando Rastelli1, Jana Schlücking2, and Doris Reiter2 — 1JKU Linz, Austria — 2TU Dortmund, Germany
For photonic quantum technology applications, a photon indistinguishability close to unity is essential, and even more desirable at elevated temperatures reachable by Stirling cryocoolers. Here, we present temperature-dependent two-photon-interference measurements of the negative trion in a GaAs quantum dot, in excellent agreement with theoretical predictions accounting for electron-phonon interaction and coupling to higher excited (hot) states. We find that the Hong-Ou-Mandel visibility VHOM drops from near unity indistinguishablity with VHOM = 0.966(6) at 4.5 K to VHOM = 0.048(37) at 55 K. We show that this loss can be primarily attributed to the interaction with energetically closely spaced excited trion states. Our results outline pathways toward maintaining high photon indistinguishability at elevated temperatures by employing Purcell enhancement of the emission rate and increasing the energy separation of the excited states.
Keywords: Two-photon interference; Quantum Dots; Temperature