SKM 2021 – scientific programme

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HL: Fachverband Halbleiterphysik

HL 14: Materials and devices for quantum technology (joint session HL/TT)

HL 14.3: Talk

Wednesday, September 29, 2021, 10:45–11:00, H4

On-chip Stark tuning of deterministically fabricated quantum dot waveguide systems — Peter Schnauber, Jan Große, Arsenty Kaganskiy, Maximilian Ott, Pavel Anikin, Ronny Schmidt, •Sven Rodt, and Stephan Reitzenstein — Institute of Solid State Physics, Technische Universit'at Berlin, Hardenbergstraße 36, D-10623 Berlin, Germany

On-chip quantum photonic circuits based on monolithic waveguides structures provide a compact and robust solution for setting up quantum logics and processors. The required structuring has already reached a very high level in different material systems but the monolithic integration of a number of single-photon emitters with identical emission wavelength is still a crux of the matter. We tackle this issue by deterministically integrating single InGaAs/GaAs quantum dots (QDs) into pin-doped GaAs/AlGaAs waveguides by in-situ electron-beam lithography (iEBL) [1]. This approach promises the integration of QDs with quasi-identical emission wavelength in combination with a fine-tuning mechanism via the quantum confined Stark effect. The wavelength accuracy in the pre-selection step of iEBL was about 0.2 nm which is nicely covered by tuning-range of about 0.4 nm when applying a bias voltage of up to 1.2 V. This paves the way for the fabrication of scalable quantum photonic circuits that rely on photon interference from multi emitters.

[1] P. Schnauber et al., APL Photonics 6, 050801 (2021)