Mainz 2026 – wissenschaftliches Programm
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Q: Fachverband Quantenoptik und Photonik
Q 48: QuanTour IV – Building Blocks
Q 48.6: Vortrag
Donnerstag, 5. März 2026, 12:30–12:45, P 7
Mode-engineering in quantum dot single photon sources to increase collection and excitation efficiency — •Samuel Huber1, Albert Adiyatullin2, Viviana Villafane2, Dario A. Fioretto1, Sebastien Boissier2, Huong Thi Au2, and Pascale Senellart1 — 1C2N, Palaiseau, France — 2Quandela, Massy, France
The development of photonic quantum technologies requires high quality single photon sources in terms of brightness, purity, and indistinguishability. In my PhD, I aim to improve these metrics in micropillar quantum dot single photon sources by studying the optical eigenmodes in the micropillar. The eigenmodes spatial overlap with the mode of the collection path directly contributes to the single photon source brightness. Quantifying this coupling efficiency also reveals new pathways to enhance the efficiency of detuned quantum dot excitation protocols. Standard detuned-pulse schemes are fundamentally constrained by the micropillar stopband, which suppresses field penetration into the cavity mode, increasing the required excitation power. To mitigate this limitation, I am exploring the coupling of the detuned pulses to higher-order cavity modes, as well as to auxiliary modes engineered through additional spacer layers within the Bragg-mirror stack. These engineered modes provide improved spectral overlap and field confinement for off-resonant driving, enabling a viable route towards high-efficiency Swing-Up (SUPER) excitation in micropillar resonators.
Keywords: Quantum dot; Micropillar cavity; Cavity mode; Single photon