Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.75: Poster

Mittwoch, 7. September 2022, 18:00–20:00, P2

Purcell enhanced two indistinguishable emissions from two separated quantum dots for on-chip complex photonics quantum circuits — •Yuhui Yang1, Shulun Li1,2, Johannes Schall1, Sven Rodt1, Zhichuan Niu2, and Stephan Reitzenstein11Institut für Festkörperphysik, TU Berlin, Berlin, Germany — 2State Key Laboratory for Superlattice and Microstructures, Institute of Semiconductors, Chinese Academy of Sciences, Beijing, China

Quantum dots (QDs) are excellent single-photon emitters with a close to ideal quantum nature of emission. For large-scale integrated photonic quantum circuits, indistinguishable and bright single photons emitted by independent QDs are required. In this regard, QDs integrated into nanocavities that are compatible with on-chip waveguide systems are highly interesting since they have a small footprint while providing strong Purcell enhancement.

Here, we demonstrate the deterministic integration of two spectrally similar single QDs in separate, one-dimensional photonic crystal nanobeam cavities with significant Purcell enhancement. Our flexible and accurate deterministic fabrication concept allows us to combine the nanobeam waveguides with integrated QDs into a 2 2 on-chip multimode interferometer (MMI) beam splitter with a 50/50 splitting ratio to perform on-chip Hanbury Brown and Twiss (HBT) and Hong-Ou-Mandel (HOM) measurements. The obtained results demonstrate that our approach is very promising toward two-photon interference from monolithic independent single-photon emitters, and fully integrated photonic quantum circuits.

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