Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 8: Quantum Dots and Wires 2: Optics 1

HL 8.1: Hauptvortrag

Montag, 5. September 2022, 15:00–15:30, H32

Crux of Using the Cascaded Emission of a Three-Level Quantum Ladder System to Generate Indistinguishable Photons — •Eva Schöll^1,2, Lucas Schweickert², Lukas Hanschke^1,3, Katharina D. Zeuner², Friedrich Sbresny³, Thomas Lettner², Rahul Trivedi⁴, Marcus Reindl⁵, Saimon Filipe Covre da Silva⁵, Rinaldo Trotta⁶, Jonathan Finley³, Jelena Vučković⁴, Kai Müller³, Armando Rastelli⁵, Val Zwiller², and Klaus D. Jöns^1,2 — ¹PhoQS, CeOPP, and Department of Physics, Paderborn University, Germany — ²KTH Stockholm, Sweden — ³WSI, MCQST and TUM Munich, Germany — ⁴Stanford University, California, USA — ⁵JKU Linz, Austria — ⁶Sapienza University Rome, Italy

Single and indistinguishable photons are basic building blocks for many quantum technology applications. Here (PRL, 125, 233605 (2020)), we investigate the degree of indistinguishability of cascaded photons emitted from a three-level quantum ladder system; in our case the biexciton-exciton cascade of semiconductor quantum dots. Despite unprecedented single-photon purity, we theoretically show that the indistinguishability for both emitted photons is inherently limited by the ratio of the lifetimes of the excited and intermediate states. We confirm this finding both experimentally and with quantum optical simulations by comparing the quantum interference visibility of cascaded and noncascaded exciton emission of the same quantum dot. Based on our model, we propose photonic structures or stimulated emission (PRL, 128, 093603, (2022)) from the excited to the intermediate state to increase the lifetime ratio and overcome the limited indistinguishability.