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HL: Fachverband Halbleiterphysik

HL 7: Poster I

HL 7.64: Poster

Montag, 27. März 2023, 13:00–15:00, P2/EG

Design of circular Bragg resonators in the telecom band for efficient emission of entangled and indistinguishable photons from semiconductor quantum dots — •Dustin Siebert, David Bauch, Klaus D. Jöns, Stefan Schumacher, and Jens Förstner — Electrical Engineering Department, Physics Department, CeOPP and PhoQS, Paderborn University, Germany

The generation of indistinguishable and entangled photons via the biexciton-exciton cascade in semiconductor quantum dots can be tailored by a photonic environment providing an increased emission rate through the Purcell effect and a cavity feedback [1,2].

Circular Bragg resonators exhibit exactly these properties and enable good collection efficiency over a large bandwidth. We developed an optimization strategy based on a two-step process. First, we use a batch of 2D electromagnetic simulations within Bayesian global optimization and finally polish the optimum through Nelder-Mead local optimization based on full 3D simulations.

The optical properties obtained are then used within a quantum mechanical simulation of the carrier dynamics in the semiconductor quantum dots including phonon interaction [3]. After optimization, we achieve a tremendous enhancement of the indistinguishability of the emitted photons even considering that real structures might suffer fabrication imperfections.

[1] E. Schöll, et al., Phys. Rev. Lett. 125, 233605 (2020) [2] F. Sbresny, et al., Phys. Rev. Lett. 128, 093603 (2022) [3] D. Bauch et al., Phys. Rev. B 104, 085308 (2021)