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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 Schöll1,2, Lucas Schweickert2, Lukas Hanschke1,3, 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. Jöns1,21PhoQS, 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.

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DPG-Physik > DPG-Verhandlungen > 2022 > Regensburg