Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 17: Quantum Dots and Wires 4: Devices

HL 17.10: Vortrag

Mittwoch, 7. September 2022, 12:15–12:30, H32

Single photons from Semiconductor Quantum Dots in Circular Bragg Gratings for Quantum Cryptography — •Daniel Vajner, Lucas Rickert, Timm Gao, Koray Kaymazlar, Jan-Niklas Donges, Johannes Schall, Sven Rodt, Stpehan Reitzenstein, and Tobias Heindel — Institut für Festkörperphysik, Technische Universität Berlin, 10623 Berlin, Germany

Semiconductor quantum dots are an excellent source of single photons for future quantum networks [1]. In order to enhance their properties they are typically incorporated into photonic structures. Among these, circular bragg gratings (CBG) are a promising way to further enhance the outcoupling efficiency [2]. Additionally, they are especially suited for fiber-coupling to achieve more compact plug-and-play single photon sources [3]. In this work we deterministically integrate single InGaAs quantum dots in CBG structures, which have been numerically optimized beforehand. We characterize the properties of the CBGs and quantify the purity and indistinguishability of the emitted photons. Finally, we aim for the implementation of cryptographic primitives such as strong quantum coin flipping using single photons.

[1] D. Vajner et al., Adv. Quantum Technol. 2100116 (2022)
[2] L. Rickert et al., Optics Express 27.25 (2019)
[3] T. Gao et al., Applied Physics Reviews 9.1 (2022)