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MON: Monday Contributed Sessions
MON 23: Poster Session: Fundamental Aspects and Model Systems
MON 23.50: Poster
Monday, September 8, 2025, 18:30–20:30, ZHG Foyer 1. OG
Controlling Indistinguishability of cascaded emissions from QDs through an Open Cavity system — •Francesco Salusti1, Mark Hogg2, Timon Luca Baltisberger2, Malwina Anna Marczak2, Nils Heinisch1, Rüdiger Schott3, Sascha René Valentin3, Andreas Dirk Wieck3, Arne Ludwig3, Stefan Schumacher1, Richard Warburton2, and Klaus Jöns1 — 1PhoQS Institute, CeOPP, and Department of Physics, Paderborn University, Paderborn, Germany — 2Philosophisch-Naturwissenschaftliche Fakultät, Departement Physik, Basel, Switzerland — 3Ruhr Universität Bochum, Faculty of Physics and Astronomy, Bochum, Germany
Cavity structures are effective tools for enhancing quantum light emitters. Tunable open cavities can be adapted to emitters like quantum dots, supporting key features for quantum communication such as on-demand emission, low multiphoton probability, and indistinguishable photons. Here we show that a tunable microcavity enhances photon pair generation from the biexciton exciton cascade, overcoming the limits of poor indistinguishability due to non-separability and time-correlation. We control exciton and biexciton emission rates via selective Purcell enhancement of the transitions using our tunable cavity. By imbalancing the lifetime ratio between biexciton and exciton photons (as suggested in E. Schöll et al. Phys.Rev.Lett.125, 233605(2020)), we achieve high Hong-Ou-Mandel visibility values for both photons emitted in the cascade. We show that the HOM visibility follows V=(τX)/(τX+τXX), matching with theoretical predictions.
Keywords: Quantum Dots; Open Cavities; Quantum Light; Photon Interference; Quantum communication