Regensburg 2022 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 25: Poster 1

HL 25.63: Poster

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

High-resolution spectroscopy of single photons from a self-assembled quantum dot — •Lucas Stahl1, Hendrik Mannel1, Fabio Rimek1, Marcel Zöllner1, Andreas Wieck2, Arne Ludwig2, Martin Geller1, and Axel Lorke11Faculty of Physics and CENIDE, University of Duisburg-Essen, Duisburg, Germany — 2Chair of Applied Solid State Physics, Ruhr-University Bochum, Germany

Self-assembled quantum dots (QD) are highly promising as building blocks for applications in future quantum information technologies, where single confined spin states can form a qubit that can be transferred to a single photon. This requires long spin and photon coherence times [1], which have been demonstrated to be limited by spin- and charge-noise as well as co-tunneling with a reservoir [1]. These dephasing mechanisms affect the linewidth of the emitted photons.

In order to study various dephasing processes that occur on the exciton and trion transition in resonance fluorescence on a single dot, we set up a laser-stabilized high-finesse Fabry-Perot-interferometer. By using a single-photon detector in combination with a picosecond time-tagger and a newly-developed post-processing method for stabilization, we obtained an interferometer resolution of 8 MHz.

This high-resolution enables us to detect dephasing mechanisms in the linewidth of the dot and to understand the influence of the Auger-scattering [2] of the trion transition in resonance fluorescence.

[1] G. Gillard et al., Quant. Inf. 7, 43 (2021). [2] A. Kurzmann et al., Nano Lett. 16, 5, 3367-3372 (2016).

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